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 # v01-32-01
 
 * 2025-05-20 Andre Sailer ([PR#1453](https://github.com/aidasoft/dd4hep/pull/1453))
   - Checksum: fix assertions on vector length during checksum calculations in debug mode, fixes #1451
   - OpaqueData: fix return value for non-void function `template <typename T> inline T& OpaqueDataBlock::bind(T&& obj)`
 
 * 2025-05-19 Andre Sailer ([PR#1450](https://github.com/aidasoft/dd4hep/pull/1450))
   - Objects: change printout for color creation from WARNING to INFO (fixup for #1449)
   - OpaqueData: fix compilation error with c++23 and gcc15.
 
 * 2025-05-16 Dmitry Kalinkin ([PR#1449](https://github.com/aidasoft/dd4hep/pull/1449))
   - Fix a regression with certain colors not saved to .root files when using ROOT 6.32.0+.
 
 # v01-32
 
 * 2025-05-07 Andre Sailer ([PR#1447](https://github.com/aidasoft/dd4hep/pull/1447))
   - ddsim: add physics.alternativeStableStatus option to allow defining alternative stable status of MCParticles meant to be treated by Geant4, fixes #1446
 
 * 2025-05-06 Wouter Deconinck ([PR#1445](https://github.com/aidasoft/dd4hep/pull/1445))
   - DDG4: Allow event readers to work with pre-existing (Event,Run)Parameters, written by other plugins.
 
 * 2025-04-15 Thomas Madlener ([PR#1444](https://github.com/aidasoft/dd4hep/pull/1444))
   - CI: Switch to `run-lcg-view` action `v5` and inject `ccache` as compiler launcher via cmake to speed up CI builds.
 
 * 2025-04-08 Wouter Deconinck ([PR#1440](https://github.com/aidasoft/dd4hep/pull/1440))
   - adopt properties of underlying Geant4GeneratorAction in Geant4SharedGeneratorAction
 
 * 2025-04-07 Andre Sailer ([PR#1442](https://github.com/aidasoft/dd4hep/pull/1442))
   - WebDisplay: fix building against current ROOT master, need further FIXME
 
 * 2025-04-04 Andre Sailer ([PR#1441](https://github.com/aidasoft/dd4hep/pull/1441))
   - CMake: drop use of ROOT:ROOTHistDraw
 
 * 2025-04-02 Alvaro Tolosa Delgado ([PR#1439](https://github.com/aidasoft/dd4hep/pull/1439))
   - Modification of `Geant4Sensitive::cellID` base class function to handle properly the cases when the step corresponds to an optical photon and the option InvokeSD is enable, so only post-step information is used to calculate the volume/cell ID.
 
 * 2025-03-28 Alvaro Tolosa Delgado ([PR#1438](https://github.com/aidasoft/dd4hep/pull/1438))
   - g4GraphicalScan: add option `-t` `--timeout` to make timeout configurable, fixes #1435
 
 * 2025-03-27 Andre Sailer ([PR#1437](https://github.com/aidasoft/dd4hep/pull/1437))
   - Geant4TVUserParticleHandler: fix wrong contains check through unit conversion. Fixes #1434
 
 * 2025-03-26 Andre Sailer ([PR#1433](https://github.com/aidasoft/dd4hep/pull/1433))
   - Geant4ParticleHandler: prevent the vertexIsNotEndpointOfParent bit set for particles that were not simulated by Geant4 for some reason.
 
 * 2025-03-25 jmcarcell ([PR#1432](https://github.com/aidasoft/dd4hep/pull/1432))
   - Remove headers that are not being used in the current file and add headers that are being used.
 
 * 2025-03-21 Andre Sailer ([PR#1429](https://github.com/aidasoft/dd4hep/pull/1429))
   - Cmake: UtilityApps: move G__eve dictionary to when we have ROOT::Eve, otherwise there is an installation error. Fixes #1424
 
 * 2025-03-20 Andre Sailer ([PR#1428](https://github.com/aidasoft/dd4hep/pull/1428))
   - CMake: do not build DDEve if ROOT::Eve does not exist. Fixes #1424
 
 * 2025-03-20 jmcarcell ([PR#1427](https://github.com/aidasoft/dd4hep/pull/1427))
   - Remove C++ preprocessor checks for a standard before C++14
 
 * 2025-03-19 leggett ([PR#1426](https://github.com/aidasoft/dd4hep/pull/1426))
   - CMake: Suppress building of UtilityApps components that require ROOT::Eve if it's not available (e.g. if ROOT was built without X11 support)
 
 * 2025-03-19 jmcarcell ([PR#1425](https://github.com/aidasoft/dd4hep/pull/1425))
   - Fix typos and other minor changes
   - Fix a few usage messages that were outdated or wrong
 
 * 2025-03-18 jmcarcell ([PR#1422](https://github.com/aidasoft/dd4hep/pull/1422))
   - Remove checks for the C compiler when configuring
   - Remove `ENABLE_LANGUAGE` which is redundant when called after `PROJECT`
 
 * 2025-03-17 leggett ([PR#1421](https://github.com/aidasoft/dd4hep/pull/1421))
   fix typo in CMakeLists.txt so that DD4HEP_DISABLE_PACKAGES list is properly parsed
 
 * 2025-03-17 Markus Frank ([PR#1420](https://github.com/aidasoft/dd4hep/pull/1420))
   - Fix for issue https://github.com/AIDASoft/DD4hep/issues/1418.
     Individual DD4HEP sub-packages can be disable from the cmake command line:
     ```
     $> cmake <other options> -DDD4HEP_DISABLE_PACKAGES="DDRec DDEve DDDigi"  ../DD4hep
     ```
     This will disable the sub-packages DDRec,DDEve,DDDigi:
     ```
     $> cmake -DDD4HEP_DISABLE_PACKAGES="DDRec DDEve DDDigi"  ../DD4hep
          -- Could NOT find LATEX (missing: LATEX_COMPILER) 
          -- No LaTeX/Biber found, cannot compile user manual.
          -- Disable package: DDEve
          -- Disable package: DDDigi
          -- Disable package: DDRec
          -- Will be building these packages: DDDetectors;DDCond;DDAlign;DDCAD;DDG4;UtilityApps
          -- Including DD4hepBuild.cmake
     ```
      Clearly no prevision can be done concerning package dependencies. This is up to the user.
      For example `DDG4` cannot be disabled if `DDDigi` should be kept.
 
 * 2025-03-13 Wouter Deconinck ([PR#1417](https://github.com/aidasoft/dd4hep/pull/1417))
   - Support multithreading in Geant4EDM4hepOutput plugin
 
 * 2025-03-13 jmcarcell ([PR#1414](https://github.com/aidasoft/dd4hep/pull/1414))
   - Fix the result of `innerMaterial()` and `outerMaterial()` depending on if the other is called first
   - Add a test that fails without this fix and passes with the fix
 
 * 2025-03-12 Markus Frank ([PR#1416](https://github.com/aidasoft/dd4hep/pull/1416))
   - Improve the response of geoDisplay when invoked for help.
   - This PR fixes issue: https://github.com/AIDASoft/DD4hep/issues/1409
   - Now geoDisplay -h / -help / --help gives the following output:
   ```
   $ geoDisplay -h
   PersistencyIO    INFO  +++ Set Streamer to dd4hep::OpaqueDataBlock
   DD4hep           INFO  ++ Using globally Geant4 unit system (mm,ns,MeV)
   Info in <TGeoManager>: Changing system of units to Geant4 units (mm, ns, MeV).
   Info in <TGeoManager::TGeoManager>: Geometry default, Detector Geometry created
   Info in <TGeoNavigator::BuildCache>: --- Maximum geometry depth set to 100
   geoPluginRun: No geometry input supplied. No geometry will be loaded.
      ------------------------------------------------------------------
     | Welcome to ROOT 6.35.01                        https://root.cern |
     | (c) 1995-2024, The ROOT Team; conception: R. Brun, F. Rademakers |
     | Built for linuxx8664gcc on Jan 20 2025, 14:50:44                 |
     | From heads/master@v6-31-01-4781-gce5f87d2f4                      |
     | With g++-12 (Ubuntu 12.3.0-17ubuntu1) 12.3.0                     |
     | Try '.help'/'.?', '.demo', '.license', '.credits', '.quit'/'.q'  |
      ------------------------------------------------------------------
   
   Usage: -plugin DD4hep_GeometryDisplay  -arg [-arg]                                
   
        Invoke the ROOT geometry display using the factory mechanism.                
   
        -detector <string> Top level DetElement path. Default: '/world'                
        -option   <string> ROOT Draw option.    Default: 'ogl'                         
        -level    <number> Visualization level  [TGeoManager::SetVisLevel]  Default: 4 
        -visopt   <number> Visualization option [TGeoManager::SetVisOption] Default: 1
        -load              Only load the geometry. Do not invoke the display          
        -help              Print this help output  
        Arguments given: -help
   
   ```
   - Unfortunately we were not really following the linux rules concerning options:
     - one letter options:     `-<letter> <value>` or
     - multi letter options:  `--<options>=<value>`
    - maybe we should at some time make an effort to homogenize the behavior.
 
 * 2025-03-10 Markus Frank ([PR#1415](https://github.com/aidasoft/dd4hep/pull/1415))
   - Several transparent changes, which should improve the deficiencies of the coverity scans.
 
 * 2025-03-07 Andre Sailer ([PR#1412](https://github.com/aidasoft/dd4hep/pull/1412))
   - HTML User Docs: remove margin from sectionToc, online this squashes the Toc lines more than offline for some reason
 
 * 2025-03-07 Andre Sailer ([PR#1411](https://github.com/aidasoft/dd4hep/pull/1411))
   - HTML User Docs: move Table of Content toc to absolute position at 150% of page width. Let's table of content scroll along with the page.
 
 * 2025-03-07 Andre Sailer ([PR#1410](https://github.com/aidasoft/dd4hep/pull/1410))
   - Documentation: fix relative location of CSS files in html user manuals
 
 * 2025-03-05 Dmitry Kalinkin ([PR#1408](https://github.com/aidasoft/dd4hep/pull/1408))
   - `ROOT_LIBRARY_PATH` will now be updated by thisdd4hep.sh. This is needed to instruct Cling to prefer a particular dd4hep path. see https://github.com/root-project/root/blob/a588ea2cbc286afcc5e2b06dfdcae139b470da96/README/ReleaseNotes/v624/index.md?plain=1#L76
 
 * 2025-02-18 Markus Frank ([PR#1405](https://github.com/aidasoft/dd4hep/pull/1405))
   Enable random seed printout to debug flaky BoxOfStraws example
 
 * 2025-02-17 Markus Frank ([PR#1404](https://github.com/aidasoft/dd4hep/pull/1404))
   - Remove compiler warnings for MacOS
 
 * 2025-02-17 Markus Frank ([PR#1403](https://github.com/aidasoft/dd4hep/pull/1403))
   - All tests in the examples directory using geant4 simulation and dependencies of these tests have the following convention:
     `<test-directory>_sim_<other unique name>`, where `test_directory` is `CLICSiD, ClientTests, DDDigi, DDG4, MySensDet, etc`.
   - This allows to consistently exclude all tests which require simulation as an input by running:
     `$> ctest -E _sim_`
 
 * 2025-02-12 Daniel Jeans ([PR#1401](https://github.com/aidasoft/dd4hep/pull/1401))
   - Fixes incorrect assumption in g4GraphicalScan.py when parsing output of Geant4MaterialScanner.
 
 * 2025-02-10 Daniel Jeans ([PR#1398](https://github.com/aidasoft/dd4hep/pull/1398))
   - this PR improves robustness of g4GraphicalScan tool
   -- run short pilot job with timeout, to catch mal-defined models which cause ddsim to hang
   -- remove assumption about the edge of world volume
   -- deal with case when requested point is outside world volume
 
 * 2025-02-07 Daniel Jeans ([PR#1397](https://github.com/aidasoft/dd4hep/pull/1397))
   - add python utility g4GraphicalScan.py to produce 2-d scan of a detector model
      - similar to graphicalScan, but directly reads the g4 geometry (rather than the DDRec geometry used by graphicalScan)
      - this can therefore cope with CAD-based elements ( see https://github.com/AIDASoft/DD4hep/issues/1322 )
 
 # v01-31
 
 * 2025-01-27 Andrii Verbytskyi ([PR#1378](https://github.com/aidasoft/DD4hep/pull/1378))
   - Use standard locations if the LD_LIBRARY_PATH or ROOTSYS are empty, i.e. /usr/lib,usr/lib64, etc.
 
 * 2025-01-25 Markus Frank ([PR#1390](https://github.com/aidasoft/DD4hep/pull/1390))
   -  Optimize the Geant4VolumeManager. Instead of mapping the Geant4 pathes as vectors of pointers,
       hash64 the pointers of the path and lookup pathes from the touchable history using this key.
   -  Relevant changes are in the files DDG4/Geant4GeometryInfo.h and src/Geant4VolumeManager.cpp.
       Everything else is only cosmetics.
 
 * 2025-01-22 Dmitry Kalinkin ([PR#1376](https://github.com/aidasoft/DD4hep/pull/1376))
   - DDSim: Steering files can now omit instantiating a new `SIM = DD4hepSimulation()`, and instead use a pre-defined variable with name `SIM`. This allows for steering files that preserve the existing state of `DD4hepSimulation` that a custom user code had set prior to the `parseOptions()` call.
 
 * 2025-01-21 Markus Frank ([PR#1387](https://github.com/aidasoft/DD4hep/pull/1387))
   Update the reference files for the Pseudotrap shape checks after mesh creation updates in ROOT.
   Pseudotrap tests are disabled for G4 units due to numerical discrepancies when using G4 units vs. TGeo units.
 
 * 2025-01-20 Andre Sailer ([PR#1371](https://github.com/aidasoft/DD4hep/pull/1371))
   - DDSim: add a reader for EDM4hep files, fixes #1369 
     - DDSim can now read EDM4hep files in root format.
 
 * 2025-01-16 sss ([PR#1384](https://github.com/aidasoft/DD4hep/pull/1384))
   - DD4hep::Segmentations: add cellsSpanVolumes function to mark segmentations that that can have cells that span multiple volumes, such as the Allegro ECal.
 
 * 2025-01-16 jmcarcell ([PR#1380](https://github.com/aidasoft/DD4hep/pull/1380))
   - Revert some of the changes of https://github.com/AIDASoft/DD4hep/pull/1375 to build a vector of floats instead of doubles since the necessary constructor doesn't exist in 0.10.X.
   - Use `edm4hep::labels::CellIDEncoding` only when they are available (starting at version 0.99)
 
 * 2025-01-13 sss ([PR#1386](https://github.com/aidasoft/DD4hep/pull/1386))
   - Fix potential use of dangling temporary in exampe.
 
 * 2025-01-13 scott snyder ([PR#1385](https://github.com/aidasoft/DD4hep/pull/1385))
   - DDSim.ACtion: Fix a wrong variable in a docstring.
 
 * 2025-01-09 jmcarcell ([PR#1374](https://github.com/aidasoft/DD4hep/pull/1374))
   - Do not set or read the color flow for MCParticles from EDM4hep, 
   needed after https://github.com/key4hep/EDM4hep/pull/389
 
 * 2025-01-06 jmcarcell ([PR#1375](https://github.com/aidasoft/DD4hep/pull/1375))
   - Fix a few compiler warnings (clang 18) about:
     - Set but unused variables and unused variables or declarations
     - Deprecated constructor for a Vector3d from a Vector3f from EDM4hep
     - Missing override
     - Having a space after `operator""` is deprecated
 
 * 2024-12-10 Andre Sailer ([PR#1368](https://github.com/aidasoft/DD4hep/pull/1368))
   - HitTupleAction: change how the tree is written and filled, because that caused segfaults in LCG stack runs of dd4hep example tests.
 
 * 2024-12-10 Markus Frank ([PR#1367](https://github.com/aidasoft/DD4hep/pull/1367))
   - If memory is an issue, the Geant4 memory consumption can be reduced using the smartless option of
     G4LogicalVolume entities. This MR exposes this feature of Geant4 to dd4hep.
     Example fragment of the code:
     ```
       Volume vol = ....;
       // 2 is the Geant4 voxelization default. 0 means no voxelization,
       // values bigger than 2 will need more memory.
       int value =  0 .... 5; 
       vol.setSmartlessValue(value);
     ```
     Fixes #1361
     - An example (+test) is supplied as well: 
       - ClientTests/compact/DriftChamber.xml
       - ClientTests/scripts/DriftChamber.py
       where the voxelization is reduced.
 
 * 2024-12-10 Andre Sailer ([PR#1366](https://github.com/aidasoft/DD4hep/pull/1366))
   - DDSim: Clarify that event processing includes Initialisation time, fixes #1364
 
 * 2024-12-09 ybedfer ([PR#1365](https://github.com/aidasoft/DD4hep/pull/1365))
   - Adding a `CartesianGridUV` segmentation class, providing for a stereo readout, *i.e.* a readout at an angle w.r.t. the axes of the sensitive volume. 
   - The class is a straightforward derivation of `CartesianGridXY`, with only few extras needed to register the _angle_ parameter and execute the rotation.
 
 * 2024-12-05 Andre Sailer ([PR#1362](https://github.com/aidasoft/DD4hep/pull/1362))
   - Geant4AssemblyVolume: use the same copy ID for the Geant4 Volume as was set in DD4hep geometry construction, fixes #1360 .
 
 * 2024-11-28 BrieucF ([PR#1359](https://github.com/aidasoft/DD4hep/pull/1359))
   - Increased the limit on the maximum number of particles one can provide with the hepevt format from 1 to 50 M, fixes #1356
 
 * 2024-11-22 Alvaro Tolosa Delgado ([PR#1358](https://github.com/aidasoft/DD4hep/pull/1358))
   - Drift chamber data extension `DCH_info_struct` has been extended with functions to calculate the projection of a point into a wire
 
 * 2024-11-21 ybedfer ([PR#1357](https://github.com/aidasoft/DD4hep/pull/1357))
   Bug fix in `CylindricalGridPhiZ`:
      - In the `cellId` member method, one now refrains from reducing the phi parameter modulo 2pi when its IDdescriptor is signed.
      - When the offset is null, this means that the phi range is now [-pi,pi], instead of the previously [0,2pi] which is not appropriate for a signed quantity.
 
 * 2024-11-19 Andre Sailer ([PR#1355](https://github.com/aidasoft/DD4hep/pull/1355))
   - CMake: fix for using Geant4 with internal CLHEP, fix linking error where -lG4clhep was not found. Fixes #1354
 
 * 2024-11-11 Andre Sailer ([PR#1352](https://github.com/aidasoft/DD4hep/pull/1352))
   - DDG4: add possibility to control verbosity for physics constructors
   - DDSim: add new `--output.physics` parameter to control output level for physics constructors, fixes #1351
 
 * 2024-11-07 Andre Sailer ([PR#1349](https://github.com/aidasoft/DD4hep/pull/1349))
   - PythonPlugin: replace deprecated Eval with Exec (root 6.36 need)
 
 * 2024-11-07 Alvaro Tolosa Delgado ([PR#1348](https://github.com/aidasoft/DD4hep/pull/1348))
   - DDRec/DCH_info.h: make inline definition of insertion operator of DCH_info class. This fixes 'multiple definition' compilation error when header is included more than once.
 
 * 2024-11-04 Markus Frank ([PR#1347](https://github.com/aidasoft/DD4hep/pull/1347))
   - Remove plenty of override warnings from DDG4 compilation
   - Spotted by accidence when checking LHCb nightly builds.
 
 * 2024-10-24 Andre Sailer ([PR#1342](https://github.com/aidasoft/DD4hep/pull/1342))
   - DDSim: add SignalHandler, add disableSignalHandler flag to turn it off (cf. #1330)
   - Examples: make RICH depend on DDG4 for the test
   - DDCad: make two tests depend on DDG4
 
 * 2024-10-22 Markus Frank ([PR#1341](https://github.com/aidasoft/DD4hep/pull/1341))
   - Addendum to MR https://github.com/AIDASoft/DD4hep/pull/1300.
 
 * 2024-10-21 Markus Frank ([PR#1339](https://github.com/aidasoft/DD4hep/pull/1339))
   - Addendum to MR https://github.com/AIDASoft/DD4hep/pull/1336 which fixes a compilation error on MACOS.
 
 * 2024-10-21 Andre Sailer ([PR#1338](https://github.com/aidasoft/DD4hep/pull/1338))
   - CI: add macOS build again
 
 * 2024-10-18 Andre Sailer ([PR#1337](https://github.com/aidasoft/DD4hep/pull/1337))
   - CMake: explicitly ask for ROOTEve component if it exists so we potentially find the non-builtin nlohmann_json
 
 * 2024-10-18 Markus Frank ([PR#1336](https://github.com/aidasoft/DD4hep/pull/1336))
   Add implementation for signal handling. 
   - The generic signal handler in DDCore may be used and specialized by applications as shon in the DDG4 package (see for details src/Geant4Kernel.h)
   - Use generic signal handler in DDG4 for controlled shutdown on CTRL-C. 
   - Add test DDG4_SIGINT_handler in examples/DDG4
     to enable the signal handling use from python:
     ```
     geant4 = DDG4.Geant4(kernel, tracker='Geant4TrackerCombineAction')
     geant4.registerInterruptHandler() 
     ```
     Please note: The signal handler must be explicitly installed. DDG4 is a library framework and does not intervene in actions which users possibly want to handle themselves! This mechanism looks simple enough that it should not be annoying.
   - This MR should implement [issue#1330](https://github.com/AIDASoft/DD4hep/issues/1330) and supposedly supersedes [PR#1300](https://github.com/AIDASoft/DD4hep/pull/1300)
 
 * 2024-10-17 Andre Sailer ([PR#1334](https://github.com/aidasoft/DD4hep/pull/1334))
   - checkOverlaps: move from DDG4 to DDCore as this does not depend on Geant4, no impact on users
   - checkGeometry: move from DDG4 to DDCore as this does not depend on Geant4, no impact on users
   - CI: Key4hep: set CMAKE_INSTALL_LIBDIR=lib because Qt6 sets GNUInstallDir
 
 * 2024-10-17 jmcarcell ([PR#1333](https://github.com/aidasoft/DD4hep/pull/1333))
   - Use `edm4hep::labels::CellIDEncoding` instead of "CellIDEncoding"
   - Use `podio::collMetadataParamName` instead of hardcoding the convention of adding `__`
 
 * 2024-10-17 Andre Sailer ([PR#1332](https://github.com/aidasoft/DD4hep/pull/1332))
   - ImportTest: change 'error' to 'fehler' to avoid triggering test failures for spurious warning from gosam package in lcg stacks
 
 * 2024-10-16 Andre Sailer ([PR#1331](https://github.com/aidasoft/DD4hep/pull/1331))
   - Conditions: change FIRST_KEY, LAST_KEY to constexpr instead of anonymous enum
 
 * 2024-10-15 BrieucF ([PR#1329](https://github.com/aidasoft/DD4hep/pull/1329))
   - ddsim: Set `edm4hep` the default output format in case DD4hep is compiled with both `DDD4HEP_USE_LCIO` `DD4HEP_USE_EDM4HEP` ON
   - ddsim: Change the name of the default output file from dummyOutput to ddsimOutput
 
 * 2024-10-15 Bohdan Dudar ([PR#1326](https://github.com/aidasoft/DD4hep/pull/1326))
   - Add xercesc parsing of environment variables in the xml path https://github.com/iLCSoft/Marlin/issues/60
 
 * 2024-10-03 Dmitry Kalinkin ([PR#1327](https://github.com/aidasoft/DD4hep/pull/1327))
   * ASSIMPWriter: fix "warning: unqualified call to 'std::move'"
 
 * 2024-09-19 Markus Frank ([PR#1324](https://github.com/aidasoft/DD4hep/pull/1324))
   Add warning if TGeo materialScan hits TGeoTessellated volumes. 
   
   The DDRec MaterialManager and hence the corresponding MaterialScan use TGeo tracking through volumes.
   Tracking in TGeo is not implemented for tessellated shapes as they result from CAD shapes. Though TGeo tracking is used
   in the material scanner.... In TGeo tessellated surfaces behave like their bounding box. Hence they have no real shape 
   and for this reason you only see a "box". 
   TGeo tracking for tessellated shapes will only be implemented once TGeo moves to VecGeom. This will still take some time.
   
   
   See github issue https://github.com/AIDASoft/DD4hep/issues/1322 for details about the discussion.
 
 # v01-30
 
 * 2024-08-25 Andre Sailer ([PR#1317](https://github.com/aidasoft/dd4hep/pull/1317))
   - DDSim: regexSD fix infinite loop, but change the interface from assignment to dictionary entries. Have to ensure only a single entry of a detector is given to the RegexSD
 
 * 2024-08-15 Sanghyun Ko ([PR#1315](https://github.com/aidasoft/dd4hep/pull/1315))
   - DDSim: prevent Geometry.regexSensitiveDetector from always throwing exception when called with argument.
 
 * 2024-08-13 Andre Sailer ([PR#1312](https://github.com/aidasoft/dd4hep/pull/1312))
   - GitlabCI: drop Flake check, since we have that on github as well
 
 * 2024-08-12 Andre Sailer ([PR#1310](https://github.com/aidasoft/dd4hep/pull/1310))
   - GitlabCI: Use an el9 container to build documentation for the webpage
 
 * 2024-08-12 Andre Sailer ([PR#1309](https://github.com/aidasoft/dd4hep/pull/1309))
   - CLICSiD AClick tests: avoid running in parallel, tests might break
 
 * 2024-08-12 Andre Sailer ([PR#1308](https://github.com/aidasoft/dd4hep/pull/1308))
   - Geant4RegexSensitivesConstruction: allow using regex that don't match the full volume path, reduce time by 40% or so
   - DDSim: add interface for Geant4RegexSensitivesConstruction to geometry construction
 
 * 2024-07-30 Leonhard Reichenbach ([PR#1303](https://github.com/aidasoft/dd4hep/pull/1303))
   - Added a Geant4TVUserParticleHandler that can utilise an arbitrary tracking volume as introduced in https://github.com/AIDASoft/DD4hep/pull/384
 
 * 2024-07-24 ybedfer ([PR#1294](https://github.com/aidasoft/dd4hep/pull/1294))
   - Adding a "CylindricalGridPhiZ" segmentation class.
      - N.B.: the class has a "radius" data member, registered by the constructors.
 
 * 2024-07-22 Markus Frank ([PR#1301](https://github.com/aidasoft/dd4hep/pull/1301))
   - See issue https://github.com/AIDASoft/DD4hep/issues/1292 and PR https://github.com/AIDASoft/DD4hep/pull/1293 , fix crash when action dictionary not hashable.
 
 * 2024-07-22 Andre Sailer ([PR#1299](https://github.com/aidasoft/dd4hep/pull/1299))
   - CI: use alma9 stack for python lint check
   - CI: move key4hep stack to alma9
 
 * 2024-07-22 Sanghyun Ko ([PR#1298](https://github.com/aidasoft/dd4hep/pull/1298))
   - Geant4Converter: Improve lookup speed of `GeoHandler::i_collect` by using `std::set` instead of `std::find` (issue #1291)
 
 * 2024-07-06 jmcarcell ([PR#1290](https://github.com/aidasoft/dd4hep/pull/1290))
   - Add the missing header unistd.h in a file to find `::open` and `::close`
   - Fix a few warnings about unused variables or shadowing
   - Add .cache and compile_commands.json to .gitignore
 
 * 2024-07-05 Markus Frank ([PR#1289](https://github.com/aidasoft/dd4hep/pull/1289))
   * Add RegexSD example for illustration: See https://github.com/AIDASoft/DD4hep/pull/1288
 
 * 2024-07-05 Markus Frank ([PR#1288](https://github.com/aidasoft/dd4hep/pull/1288))
   - As reported in this issue https://github.com/AIDASoft/DD4hep/issues/1285 under certain circumstances the memory usage of DDG4 goes through the roof. This was traced back to the creation of excessive maps in the `Geant4VolumeManager`, if the number of sensitive pathes is very high like e.g. for straw detectors.
   - To solve the problem, geometry constructors may not declare any sensitive volumes. Hence the `Geant4VolumeManager` will not be populated. To still make Geant4 functioning, the sensitive volumes may be declared a posterior after conversion using regular expressions as implemented in the class `Geant4RegexSensitivesConstruction`. This class is only an example how such functionality may be achieved: other solutions are possible as well. This functionality can be switched at the level of each subdetector participating in the experiment setup.
   - To illustrate, an example detector `BoxOfStraws` was constructed with a flag in the xml description:
 
   ```
       <detector id="1" name="BoxOfStrawsDet" type="DD4hep_BoxOfStraws" readout="BoxOfStrawsHits" vis="VisibleGreen" region="StrawRegion" limits="BoxOfStrawsLimitSet">
         <box      x="1*m"    y="1*m" z="1000*mm"  limits="BoxOfStrawsLimitSet" vis="VisibleRed"/>
         <straw rmax="0.5*mm" y="1*m" thickness="0.1*mm" vis="VisibleBlue">
           <material name="Iron"/>
         </straw>
         <gas vis="VisibleGreen">
           <material name="Argon"/>
           <non_sensitive/>
         </gas>
         <position x="0*m"   y="0*m"   z="0*m"/>
         <rotation x="0"     y="0"     z="0"/>
       </detector>
   ```
 
   Change `<non_sensitive/>` to `<sensitive/>` and the different behavor of memory allocation when starting Geant4 can be observed.
   The corresponding Geant4 python script can be found here:
 
   ```
   <DD4hep>/examples/ClientTests/scripts/BoxOfStraws.py
   ```
 
   The memory consumption differs then as follows (depending on the thickness of the straws, which determine the number of sensitive pathes):
 
   ```
   With explicit sensitive volumes:   
   before Geant4VolumeManager:    Virtual: 903.3m   resident: 690.5m
   after Geant4VolumeManager:     Virtual: 1848.2m  resident: 1.6g   
   
   
   With Sensitives matching regex and not sensitive volumes declared:
   before Geant4VolumeManager:    Virtual: 903.3m   Resident: 690.6m 
   after Geant4VolumeManager:     Virtual: 903.3m   Resident: 690.6m 
   Simulating:                    Virtual: 903.5m   Resident: 692.6m 
   ```
 
   Hence this is a possibility to significantly reduce memory consumption for highly granular subdetectors.
 
 * 2024-07-01 Markus Frank ([PR#1287](https://github.com/aidasoft/dd4hep/pull/1287))
   - As noted by Ben, the global alignment does not work in the presence of assemblies.
     This PR together with https://github.com/root-project/root/pull/15905 fixes this deficiency.
   - An example was added to convert a globally misaligned geometry to Geant4:
     ` $ python examples/AlignDet/scripts/AlephTPC.py -batch -events 5 -alignments examples/AlignDet/compact/AlephTPC_alignment.xml`
 
 * 2024-07-01 jmcarcell ([PR#1286](https://github.com/aidasoft/dd4hep/pull/1286))
   - Fix warnings related to unused variables and shadowing of already existing variables
   - Don't use the deprecated `PySys_SetArgv`
 
 * 2024-06-26 Andre Sailer ([PR#1284](https://github.com/aidasoft/dd4hep/pull/1284))
   - DDG4.inputHandling: do not simulate rejectPDG particles even if they are called stable by the generator file, fixes #1282
 
 * 2024-06-26 Andre Sailer ([PR#1283](https://github.com/aidasoft/dd4hep/pull/1283))
   - DDSim: Do not check for existence of files behind a URL like root://, fixes #1281
 
 * 2024-06-24 jmcarcell ([PR#1280](https://github.com/aidasoft/dd4hep/pull/1280))
   - CMake: Allow finding version 1.0 (and newer) for podio
 
 * 2024-06-21 Markus Frank ([PR#1279](https://github.com/aidasoft/dd4hep/pull/1279))
   - The conquest against tainted variables in coverity
 
 * 2024-06-20 Markus Frank ([PR#1278](https://github.com/aidasoft/dd4hep/pull/1278))
   - Fight coverity tainted variables.
 
 # v01-29
 
 * 2024-06-06 Andre Sailer ([PR#1277](https://github.com/aidasoft/DD4hep/pull/1277))
   - Geant4Converter: fix the order of the TGeoNode conversion to Geant4 volumes, using vector instead of set. Maybe fixes #1271
 
 * 2024-05-26 Andre Sailer ([PR#1276](https://github.com/aidasoft/DD4hep/pull/1276))
   - XMLElements: fix build when not using XercesC, failing to include header files
 
 * 2024-05-23 Markus Frank ([PR#1275](https://github.com/aidasoft/DD4hep/pull/1275))
   - The battle agains coverity
   - The last defects I know how to solve. For the rest more expertise is required.
 
 * 2024-05-23 MarkusFrankATcernch ([PR#1274](https://github.com/aidasoft/DD4hep/pull/1274))
   - Allow coverity scans being started manually
 
 * 2024-05-23 Markus Frank ([PR#1272](https://github.com/aidasoft/DD4hep/pull/1272))
   - The battle agains coverity. Try to fix various defects.
 
 * 2024-05-22 Markus Frank ([PR#1270](https://github.com/aidasoft/DD4hep/pull/1270))
   - The battle agains coverity: Attack and reduce coverity errors
 
 * 2024-05-22 Markus Frank ([PR#1269](https://github.com/aidasoft/DD4hep/pull/1269))
   - Code maintenance: change quoted include statements to angular brackets in subpackage DDG4.
 
 * 2024-05-22 Markus Frank ([PR#1268](https://github.com/aidasoft/DD4hep/pull/1268))
   Code maintenance: 
   - change quoted include statements in DDCore to angular brackets
   - Add the odd licence statement
   - Remove obsolete file DD4hep/TGeoUnits.h: Take TGeoUnits from ROOT if needed. 
     This file dates back to the time TGeoUnits.h did not exist in ROOT.
 
 * 2024-05-21 Markus Frank ([PR#1267](https://github.com/aidasoft/DD4hep/pull/1267))
   - Try to eliminate more coverity code deficiencies
    (See https://scan.coverity.com/projects/dd4hep?tab=overview)
 
 * 2024-05-16 Andre Sailer ([PR#1266](https://github.com/aidasoft/DD4hep/pull/1266))
   - DDSim: make setupUserFunction be documented in the steering file
   - Fix random typos in comments and doxygen strings
   - Geant4Handle: Fix error message when plugin casting did not succeed
 
 * 2024-05-16 Markus Frank ([PR#1265](https://github.com/aidasoft/DD4hep/pull/1265))
   - Fix some coverity problems
 
 * 2024-05-16 tmadlener ([PR#1264](https://github.com/aidasoft/DD4hep/pull/1264))
   - EDM4hepOUTPUT: Introduce pre-processor checks to transparently switch to the new `std::optional` return values of `podio::Frame::getParameter` (introduced with [AIDASoft/podio#580](https://github.com/AIDASoft/podio/pull/580))
 
 * 2024-05-16 Thomas Latham ([PR#1263](https://github.com/aidasoft/DD4hep/pull/1263))
   - Enhance handling of transformations in VolumeBuilder
 
 * 2024-05-15 Markus Frank ([PR#1262](https://github.com/aidasoft/DD4hep/pull/1262))
   - Add optional instantiation of the G4ScoringManager together with the G4RunManager.
     The instantiation can be steered by option to the Geant4Kernel:
   ```
   import DDG4
   g4 = DDG4.Geant4()
   g4.kernel().HaveScoringManager = True
   ```
   For rational, please see issue: https://github.com/AIDASoft/DD4hep/issues/1261
 
 * 2024-05-13 Alvaro Tolosa Delgado ([PR#1253](https://github.com/aidasoft/DD4hep/pull/1253))
   - DDRec/DCH_info.h: Add data extension class for FCCee Drift Chamber. This class provides data storage and ancillary functionalities needed to build the geometry.
 
 * 2024-05-10 Andre Sailer ([PR#1260](https://github.com/aidasoft/DD4hep/pull/1260))
   - DDG4/DDSim: allow configuring of the unstable generator status codes with SIM.physics.alternativeDecayStatuses. This allows one to tweak which particles are passed to the Geant4 simulation. Fixes #1256 
   - DDG4: Geant4InputAction: move setting of generator status bits to a common place, reduce code duplication.
 
 * 2024-05-07 Markus Frank ([PR#1259](https://github.com/aidasoft/DD4hep/pull/1259))
   - Protect Geant4 Primary creation against negative masses.
   - See issue https://github.com/AIDASoft/DD4hep/issues/1233 for a detailed discussion of the problem.
   - Allow shapes to be defined recursively using shape creation plugin.
   - Show how to properly use CAD shapes with a non-zero origin (Issue : https://github.com/AIDASoft/DD4hep/issues/1200)
      examples/DDCAD/compact/DD4hep_Issue_1134_resolved.xml
      Once the CAD shape (aka volume) is placed correctly into the origin of a mother mother, the mother can then be placed 
      rotated and shifted according to the the boxed mother's origin like any other volume.
 
 * 2024-05-07 Andre Sailer ([PR#1258](https://github.com/aidasoft/DD4hep/pull/1258))
   - DDSim: correct the number of events when running over all events (-1), fixes #1257 
   - GenerationActionInit: declare properties to access number of processed runs (numberOfRuns) and events (numberOfEVents)
   - DDG4: decode or eval all properties out of str or cppyy.gbl.string types
 
 * 2024-04-23 Andre Sailer ([PR#1255](https://github.com/aidasoft/DD4hep/pull/1255))
   - Geant4GFlashShowerModel: remove wrong unit conversions from particleBound properties. Caused particle bounds to be off by 1e3 when GEANT_UNITS were enabled.
 
 * 2024-04-22 tmadlener ([PR#1252](https://github.com/aidasoft/DD4hep/pull/1252))
   - DDDigiEDM4hep: Switch to the correct podio pre-processor version checks for switching to the non-deprecated readers / writers. Also simplify this such that choosing which type(name) to use is handled in one place rather than several.
   - Geant4Output2EDM4hep: Switch to a non-deprecated setter for setting the MCParticle for a SimTrackerHit once EDM4hep ships with it.
 
 * 2024-04-19 Andre Sailer ([PR#1254](https://github.com/aidasoft/DD4hep/pull/1254))
   - CMake: drop possible use of ROOT::PyROOT target, always use ROOT::ROOTTPython
   - Python: remove the use of (dd)six, fix issues pointed out by new version of flake8
 
 * 2024-04-18 Andre Sailer ([PR#1242](https://github.com/aidasoft/DD4hep/pull/1242))
   - CI: change which LCG_releases/ROOT versions DD4hep is tested.
   - Fix various issues with latest version of ROOT (6-32-patches, master) and cppyy in ROOT.
      - :warning: : You may encounter issues with python setup complaining about mismatched types, strings, conversions
 
 * 2024-04-04 Andre Sailer ([PR#1251](https://github.com/aidasoft/DD4hep/pull/1251))
   - EDM4hepOutput: determine momentum vector type automagically. Make it work with any EDM4hep version correctly, fixes #1250
 
 * 2024-04-02 Andre Sailer ([PR#1248](https://github.com/aidasoft/DD4hep/pull/1248))
   - ddsim now exits with non-zero exit code when something went wrong during simulation
 
 * 2024-04-02 Wouter Deconinck ([PR#1245](https://github.com/aidasoft/DD4hep/pull/1245))
   - fix adding individual planes to existing Polycone
 
 * 2024-03-26 Andre Sailer ([PR#1247](https://github.com/aidasoft/DD4hep/pull/1247))
   - DDSim: add checks that input files and compact files exist before doing anything extensive and provide proper error message. Fixes #1246
 
 * 2024-03-21 Markus Frank ([PR#1244](https://github.com/aidasoft/DD4hep/pull/1244))
   * The build type flag was lost when including files from compact. This PR fixes this deficiency and ensures the flag propagation. Example:  'box_shape_build_type'
 
 * 2024-03-20 Alvaro Tolosa Delgado ([PR#1243](https://github.com/aidasoft/DD4hep/pull/1243))
   - Fixed TwistedTube when only half-length is provided, making the tube is symmetric along Z axis
 
 * 2024-03-13 Andre Sailer ([PR#1241](https://github.com/aidasoft/DD4hep/pull/1241))
   - CMake: dd4hep_add_dictionary: use temporary files to create dictionary to allow dependencies to use COMPILE_LANGUAGE, fixes #1239 . Add USE_COMMAND_TO_GENERATE option to fall back to previous implementation
   - CMake: dd4hep_add_dictionary: remove duplicates from definition and include_directory options when calling rootcling
 
 * 2024-02-29 Markus Frank ([PR#1238](https://github.com/aidasoft/DD4hep/pull/1238))
   - Adapt documentation for Tube(...) constructor to reality.
     See issue https://github.com/AIDASoft/DD4hep/issues/1236
 
 # v01-28
 
 * 2024-02-19 Markus Frank ([PR#1228](https://github.com/aidasoft/dd4hep/pull/1228))
   - Fix DD4hep_DetectorDump plugin to avoid crash if a DetElement placement is invalid,
      which is not allowed, but also should not end up in a crash.
   - Add test to check if DetElements have proper placement set using MiniTel example
     (see examples/ClientTests/compact/MiniTel_err_place.xml) and
     test MiniTel_check_missing_placements
   - The fake DD4hep object TwistedTube  did not correctly emulate the different constructors when converted
     to Geant4. This should be fixed with this PR.
 
 * 2024-02-16 Andre Sailer ([PR#1231](https://github.com/aidasoft/dd4hep/pull/1231))
   - CMake: use the LCIO::lcio target instead of LCIO::LCIO
 
 * 2024-02-15 Andre Sailer ([PR#1230](https://github.com/aidasoft/dd4hep/pull/1230))
   - XML: add missing std:: when building with TinyXML
   - DetectorSurfaces: silence printout when creating SurfaceList, fixes #1229
 
 * 2024-02-13 Wouter Deconinck ([PR#1225](https://github.com/aidasoft/dd4hep/pull/1225))
   - upgrade CI to checkout@v4, cvmfs@v4, upload-artifact@v4
 
 * 2024-02-12 Alvaro Tolosa Delgado ([PR#1227](https://github.com/aidasoft/dd4hep/pull/1227))
   - Twisted tube: twisted angle unit conversion now works properly
 
 * 2024-02-12 Markus Frank ([PR#1226](https://github.com/aidasoft/dd4hep/pull/1226))
   Multiple commits. Most important one (on user request):
   - Implement CONST properties to optical sufaces. (Requires new release of ROOT)
     See issue: https://github.com/AIDASoft/DD4hep/issues/1223
   
   Otherwise:
   - Remove support for very old versions of ROOT < 6.10.0
   - Remove support for very old versions of ROOT < 6.26.0. 
   - Remove default use of std namespace from most implementation files.
 
 * 2024-02-12 Wouter Deconinck ([PR#1218](https://github.com/aidasoft/dd4hep/pull/1218))
   - add command line options to pass stepping (etc) action plugins to ddsim
 
 * 2024-02-08 tmadlener ([PR#1219](https://github.com/aidasoft/dd4hep/pull/1219))
   - Make the upcoming renaming of `edm4hep::TrackerHit` to `edm4hep::TrackerHit3D` (https://github.com/key4hep/EDM4hep/pull/252) transparent as far as DD4hep is concerned.
 
 * 2024-02-07 jmcarcell ([PR#1221](https://github.com/aidasoft/dd4hep/pull/1221))
   - Change ROOTFrame{Writer,Reader} to ROOT{Writer,Reader} following https://github.com/AIDASoft/podio/pull/549
 
 * 2024-02-02 tmadlener ([PR#1198](https://github.com/aidasoft/dd4hep/pull/1198))
   - Set the momenta of the `edm4hep::MCParticle` as double instead of float once it becomes possible.
 
 * 2024-01-18 Markus Frank ([PR#1217](https://github.com/aidasoft/dd4hep/pull/1217))
   - Enable energy deposit collection in FiberTubeCalorimeter example.
 
 * 2024-01-18 Markus Frank ([PR#1216](https://github.com/aidasoft/dd4hep/pull/1216))
   - Update FiberTubeCalorimeter example
   - Fix overlapping volumes
 
 * 2024-01-17 Markus Frank ([PR#1215](https://github.com/aidasoft/dd4hep/pull/1215))
   - Fix creation of tessellated shapes from CAD files.
   -  Properly hand quadri-linear facets from CAD files.
   -  See also: https://github.com/root-project/root/pull/14327
   -  See also: https://github.com/AIDASoft/DD4hep/pull/1212
 
 * 2024-01-16 Markus Frank ([PR#1214](https://github.com/aidasoft/dd4hep/pull/1214))
   - Fix to MR https://github.com/AIDASoft/DD4hep/pull/1212
 
 * 2024-01-15 Markus Frank ([PR#1213](https://github.com/aidasoft/dd4hep/pull/1213))
   - Adapt material scan to be aware of the different compilation modes for TGeo units and Geant4 units.
     See also issue https://github.com/AIDASoft/DD4hep/issues/1163.
 
 * 2024-01-15 Andre Sailer ([PR#1212](https://github.com/aidasoft/dd4hep/pull/1212))
   - Assimp: adapt to changes in TGeoTessellated for ROOT 6.32
   - ShapeUtilities: adapt to changes in TGeoTessellated for ROOT 6.32
 
 * 2024-01-12 Markus Frank ([PR#1211](https://github.com/aidasoft/dd4hep/pull/1211))
   - Implement required chnges for new ROOT 6.31.X.
     See issue https://github.com/AIDASoft/DD4hep/issues/1210 for details.
 
 * 2024-01-08 Markus Frank ([PR#1209](https://github.com/aidasoft/dd4hep/pull/1209))
   - Restore behavior of teveDisplay. See issue https://github.com/AIDASoft/DD4hep/issues/1208 for details.
 
 * 2023-12-19 Andre Sailer ([PR#1206](https://github.com/aidasoft/dd4hep/pull/1206))
   - CI: Coverity: use el9 based stack
 
 # v01-27-02
 
 * 2023-12-15 Andre Sailer ([PR#1205](https://github.com/aidasoft/dd4hep/pull/1205))
   - Geant4PrimaryHandling: fix issue with multiple vertices in Geant4 GeneralParticleSource, fixes #1204
 
 * 2023-12-14 Markus Frank ([PR#1201](https://github.com/aidasoft/dd4hep/pull/1201))
   - Incorporate type fix from https://github.com/AIDASoft/DD4hep/pull/1172
   - Propagate polish setting from ROOT surfaces to Geant4
   - Improve debugging capabilities of detector checksums by improved dumping possibilities.
 
 * 2023-12-14 Andre Sailer ([PR#1196](https://github.com/aidasoft/dd4hep/pull/1196))
   - NestedBoxReflection_geo.cpp: use std::abs instead of abs
   - HexGrid: use std::abs instead of abs
   - DDSim: better logging of which sensitive detector is used when defaults are used
 
 * 2023-12-14 Paul Gessinger ([PR#1195](https://github.com/aidasoft/dd4hep/pull/1195))
   - Replace usage of the `imp` module that was removed in Python 3.12 with `importlib` and `types`.
 
 * 2023-11-24 Andre Sailer ([PR#1192](https://github.com/aidasoft/dd4hep/pull/1192))
   - DetectorChecksum: use fabs to check if values are 0.0, fixes  #1188
 
 # v01-27-01
 
 * 2023-11-20 jmcarcell ([PR#1191](https://github.com/aidasoft/DD4hep/pull/1191))
   - CMake: Add a check for the c++ standard that Geant4 was compiled with, and fail if it is
     different from the one required for DD4hep.
 
 * 2023-11-19 Wouter Deconinck ([PR#1190](https://github.com/aidasoft/DD4hep/pull/1190))
   - Use TROOT::GetIconPath to find icons in DDEve
 
 * 2023-11-17 Markus Frank ([PR#1187](https://github.com/aidasoft/DD4hep/pull/1187))
   - Implement startup flags to set the visualization depth in teveDisplay like for geoDisplay.
     See  Issue: See deeper hierarchy in teveDisplay  https://github.com/AIDASoft/DD4hep/issues/1186 for details.
 
 * 2023-11-17 Dmitry Kalinkin ([PR#1184](https://github.com/aidasoft/DD4hep/pull/1184))
   - Fixed runtime issues during initialization caused by incorrectly placed `DECLARE_SEGMENTATION` for CartesianGridXYStaggered and HexGrid.
 
 # v01-27
 
 * 2023-10-19 Alvaro Tolosa Delgado ([PR#1174](https://github.com/aidasoft/dd4hep/pull/1174))
   - Geant4OpticalTracker: Kill optical photons (instead of all other particles) as soon they enter into a Optical Tracker sensitive detector
 
 * 2023-10-19 Wouter Deconinck ([PR#1148](https://github.com/aidasoft/dd4hep/pull/1148))
   - Allow several DDRec c'tors to work on `const Detector&` instead of `Detector&`
 
 * 2023-10-18 Markus Frank ([PR#1181](https://github.com/aidasoft/dd4hep/pull/1181))
   Allow for XML processing of files relative to xml tag location:
   - For some tags the relative placement of include files was not possible.
     This pull request is supposed to close these missing include features.
   - See issue https://github.com/AIDASoft/DD4hep/issues/1180 for details)
   - See the examples ClientTests: minitel_config_plugins_include_command_xml
     with the compact file ClientTests/compact/IncludePlugins.xml for an example.
 
 * 2023-10-17 Alvaro Tolosa Delgado ([PR#1179](https://github.com/aidasoft/dd4hep/pull/1179))
   - DDSim: Corrected documentation of `--gun.energy`. This corresponds to the total energy including the mass of the particle
 
 * 2023-10-11 Andre Sailer ([PR#1176](https://github.com/aidasoft/dd4hep/pull/1176))
   - DDG4: G4VTouchable: for Geant4 11.1.ref09 cannot forward declare the class any more
 
 * 2023-10-11 Markus Frank ([PR#1175](https://github.com/aidasoft/dd4hep/pull/1175))
   - Handle request from issue 1166: Allow to load CAD files with relative path w/r to declaring xml file 
   - Add illustrating example: t_DDCAD_Check_Shape_RelativePath
 
 * 2023-09-20 Dhevan Gangadharan ([PR#1170](https://github.com/aidasoft/dd4hep/pull/1170))
   - Extend usage of dumpBfield to asymmetric X,Y,Z ranges.
 
 * 2023-09-20 Sebouh Paul ([PR#1161](https://github.com/aidasoft/dd4hep/pull/1161))
   - DDSegmentation: added segmentation HexGrid for hexagonal segmentation
   - DDSegmentation: added CartesionGridXYStaggered for rectangular segmentation that can be staggered for every other layer
 
 * 2023-09-19 Dmitry Kalinkin ([PR#1171](https://github.com/aidasoft/dd4hep/pull/1171))
 
 
 * 2023-09-15 jmcarcell ([PR#1169](https://github.com/aidasoft/dd4hep/pull/1169))
   - CMake: DDG4: Check if the CLHEP target exists before creating it in DD4hepBuild.cmake, since if it exists cmake will error.
 
 * 2023-09-15 Wouter Deconinck ([PR#1168](https://github.com/aidasoft/dd4hep/pull/1168))
   - ddsim: handle run header exception when the user has no username.
 
 * 2023-08-31 Dmitry Kalinkin ([PR#1165](https://github.com/aidasoft/dd4hep/pull/1165))
   - DDG4: HepMC3Input: Fix loading of run info for RootTree HepMC3 input format
 
 * 2023-08-25 Andre Sailer ([PR#1162](https://github.com/aidasoft/dd4hep/pull/1162))
   - DDEve Webdisplay: fix issue with ROOT master with RGeomViewer no longer being in the experimental namespace.
 
 * 2023-08-24 Andre Sailer ([PR#1160](https://github.com/aidasoft/dd4hep/pull/1160))
   - SiliconBlockGFlash: add maximal energy for using parametrisation, for electron and positron, fixes #1153
 
 * 2023-08-24 Markus Frank ([PR#1155](https://github.com/aidasoft/dd4hep/pull/1155))
   - Implement correct transparency handling of ROOT:
     The transparency setting was connected to the material of the volume.
     This led to the same transparency setting for all volumes of the same material.
     It was not possible to change them at the level of the volume though 
     the API  suggested so.
     See: https://github.com/AIDASoft/DD4hep/issues/1117
     See: https://github.com/root-project/root/pull/13402
   - Add test examples/ClientTests/compact/visTestEx.xml and visTest.xml.
     From the inversion of tubes with the same material, for ROOT >= 6.29
     the correct transparency settings are shown, whereas for ROOT < 6.29
     the transparency settings are the same for all volumes.
     Also see scripts/visTest.C
 
 * 2023-08-23 Ben Couturier ([PR#1159](https://github.com/aidasoft/dd4hep/pull/1159))
   - Improved _getEnviron to deal with the case when multiple variables are to be evaluated in the string
 
 * 2023-08-22 Dmitry Kalinkin ([PR#1158](https://github.com/aidasoft/dd4hep/pull/1158))
   - DDSim: Fix reading HepMC3 input files via xrootd, fixes #1156
 
 * 2023-08-22 Wouter Deconinck ([PR#1157](https://github.com/aidasoft/dd4hep/pull/1157))
   - Geant4Output2EDM4hep: allow use of identical collection names across multiple detectors
 
 * 2023-08-04 Andre Sailer ([PR#1152](https://github.com/aidasoft/dd4hep/pull/1152))
   - CI: use clang16 for header guards check
 
 * 2023-08-04 jmcarcell ([PR#1151](https://github.com/aidasoft/dd4hep/pull/1151))
   - Limits object: fix string creation of Limit::toString, this will now also print the relevant "particles"
   - Shapes: remove "move" from return of dimensions()
 
 # v01-26
 
 * 2023-07-24 Andre Sailer ([PR#1147](https://github.com/aidasoft/DD4hep/pull/1147))
   - Add reading of HepMC3 run info and forwarding it to output files: fixes #1114. Reliably this will only work for HepMC3 >= 3.2.6.
 
 * 2023-07-18 Markus Frank ([PR#1146](https://github.com/aidasoft/DD4hep/pull/1146))
   - By default do not keep hash string for detector checksum to minimize resource usage.
    As pointed out in Issue https://github.com/AIDASoft/DD4hep/issues/1143 keeping the hash string of detector
     components  is very often too resource/memory consuming. Hence keep the hashed strings only if requested
     e.g. for debugging purposes. By default the hash strings are not kept.
   This means the produces hash sums are NOT backwards compatible, because during the checksum creation the
   hash strings from sub-components were used. These are now consequently replaced by the corresponding hash codes.
 
 * 2023-07-18 Andre Sailer ([PR#1145](https://github.com/aidasoft/DD4hep/pull/1145))
   - DDSim: ConfigHelper: prevent using unknown properties everywhere but in Meta, where we want to allow adding arbitrary information, fixes #1072
 
 * 2023-07-17 Andre Sailer ([PR#1144](https://github.com/aidasoft/DD4hep/pull/1144))
   - DDSim: change the default output file name on how DD4hep was built. Fixes #1101 
      - Add outputConfig.forceLCIO, outputConfig.forceEDM4HEP, outputConfig.forceDD4HEP switches to force a particular output plugin
      - If LCIO was used, slcio is still the default
      - If EDM4hep was used but not LCIO, EDM4hep is the default and used for all root output files. 
      - If neither LCIO or EDM4hep was used, then DD4hep's root output is used. Use the outputConfig.forceDD4HEP flag to use DD4hep's root output if EDM4hep is available as well
   
   - DDSim: remove python2 legacy shims
   - Geant4UIManager: fail when pre or post run commands are not successfully executed.
 
 * 2023-07-14 Andre Sailer ([PR#1142](https://github.com/aidasoft/DD4hep/pull/1142))
   - DDSim: add the possibility to configure execution of Geant4 UI commands during the different Geant4 UI phases (fixes #1010)
 
 * 2023-07-13 Wouter Deconinck ([PR#1141](https://github.com/aidasoft/DD4hep/pull/1141))
   - Support TGeoTessellated volumes in DetectorChecksum
 
 * 2023-07-13 tmadlener ([PR#1140](https://github.com/aidasoft/DD4hep/pull/1140))
   - Create a separate `metadata` Frame in the edm4hep output and put the `CellIDEncoding` strings there in order to follow the new convention for this introduced by key4hep/k4FWCore#100.
 
 * 2023-06-24 Markus Frank ([PR#1139](https://github.com/aidasoft/DD4hep/pull/1139))
   - Add test for issue #1134
 
 * 2023-06-23 tmadlener ([PR#1138](https://github.com/aidasoft/DD4hep/pull/1138))
   - Make the default return value of `DetElementCreator::process` non-zero to avoid erroneously raising an exception after finishing. 
   - Add a test case that checks that things work
 
 * 2023-06-22 Markus Frank ([PR#1136](https://github.com/aidasoft/DD4hep/pull/1136))
   - Adds missing parts to: https://github.com/AIDASoft/DD4hep/pull/1135
   - Enable CLICSiD GDML exports and import tests and fix the broken import test.
 
 * 2023-06-22 Andre Sailer ([PR#1133](https://github.com/aidasoft/DD4hep/pull/1133))
   - DDSim: OutputConfig: correct the example to be valid python in all cases.
 
 * 2023-06-21 tmadlener ([PR#1132](https://github.com/aidasoft/DD4hep/pull/1132))
   - Add conversion from of `TGeoPara` to `G4Para`
 
 * 2023-06-16 Markus Frank ([PR#1131](https://github.com/aidasoft/DD4hep/pull/1131))
   - Fix compile error on MacOS
     See issue https://github.com/AIDASoft/DD4hep/issues/1130
 
 * 2023-06-14 Wouter Deconinck ([PR#1129](https://github.com/aidasoft/DD4hep/pull/1129))
   - fix: exit(0) when --dumpParameter/dumpSteeringFile
 
 * 2023-06-13 Markus Frank ([PR#1128](https://github.com/aidasoft/DD4hep/pull/1128))
   - Move DDDigi edm4hep I/O to new frame writing.
   - Improve DDG4 edm4hep I/O (remove debug statements)
   - Protect DDDigi edm4hep output against races
   - Fix some compiler warnings
 
 * 2023-06-12 Wouter Deconinck ([PR#1108](https://github.com/aidasoft/DD4hep/pull/1108))
   - Delay writing EDM4hep collections until `commit` at end of event, allowing for multiple collections with same name
 
 * 2023-06-09 Markus Frank ([PR#1125](https://github.com/aidasoft/DD4hep/pull/1125))
   - Define the CellID and the VolumeID data types of segmentations as uint64_t rather than signed integers.
     Reasoning: Please see issue: 1090 (https://github.com/AIDASoft/DD4hep/issues/1090)
 
 * 2023-06-09 tmadlener ([PR#1113](https://github.com/aidasoft/DD4hep/pull/1113))
   - Remove the copy&past `DigiFrame.h` and use the upstream `podio/Frame.h` as all functionality is available from there.
   - Increase the minimum podio version to 0.16.3
 
 * 2023-06-09 tmadlener ([PR#1112](https://github.com/aidasoft/DD4hep/pull/1112))
   - Use the templated `getMap` access functionality for `podio::GenericParameters` as the non-templated versions will be removed.
 
 * 2023-06-08 Markus Frank ([PR#1126](https://github.com/aidasoft/DD4hep/pull/1126))
   - Allow to user-set world material in compact description:
   ```
     <world material="Steel235">
     </world>
   ```
     See issue https://github.com/AIDASoft/DD4hep/issues/1116 for details.
   - Add test t_minitel_config_world_material illustrating the feature.
 
 * 2023-06-02 tmadlener ([PR#1124](https://github.com/aidasoft/DD4hep/pull/1124))
   - DDDigi: Make the `get{Value,}TypeName` calls work with the upcoming switch to `std::string_view` return types in podio.
 
 * 2023-06-01 Andre Sailer ([PR#1123](https://github.com/aidasoft/DD4hep/pull/1123))
   - Volumes.h: rearrange implementation of classes, fix needed for gcc13/root 6.28/04, c++20
 
 * 2023-06-01 Juraj Smiesko ([PR#1122](https://github.com/aidasoft/DD4hep/pull/1122))
   - ddsim: fix indentation from steeringfile produced by `ddsim --dumpSteeringFile`
 
 * 2023-06-01 Dmitry Kalinkin ([PR#1089](https://github.com/aidasoft/DD4hep/pull/1089))
   - Add optional support for reading compressed files using HepMC3. Enabled with cmake flag DD4HEP_HEPMC3_COMPRESSION_SUPPORT. Needs at least HepMC3.2.5 and presence of zlib, lzma, bzip2
 
 * 2023-05-31 Markus Frank ([PR#1120](https://github.com/aidasoft/DD4hep/pull/1120))
   - Fix example arguments
 
 * 2023-05-31 Dmitry Kalinkin ([PR#1106](https://github.com/aidasoft/DD4hep/pull/1106))
   - DetectorImp::getRefChild() will no longer print to error context to std::cout, it will instead appear in the message of the runtime_exception thrown.
 
 * 2023-05-30 Markus Frank ([PR#1119](https://github.com/aidasoft/DD4hep/pull/1119))
   - Disable DDCMS Geant4 example to resolve MR chain
 
 * 2023-05-30 Paul Gessinger ([PR#1109](https://github.com/aidasoft/DD4hep/pull/1109))
   - Remove `using namespace std;` in `Printout.cpp`
 
 * 2023-05-30 Andre Sailer ([PR#1100](https://github.com/aidasoft/DD4hep/pull/1100))
   - CMake: increase required version of Cmake from 3.12 to 3.14
 
 * 2023-05-30 Markus Frank ([PR#1098](https://github.com/aidasoft/DD4hep/pull/1098))
   - MiniTel Generate example should replect the detector in issue (https://github.com/AIDASoft/DD4hep/issues/1091)
 
 * 2023-05-04 Wouter Deconinck ([PR#1105](https://github.com/aidasoft/DD4hep/pull/1105))
   - allow rotation/position transformation on entire CAD_MultiVolume
 
 * 2023-04-26 Andre Sailer ([PR#1099](https://github.com/aidasoft/DD4hep/pull/1099))
   - thisdd4hep.sh: make the Geant4 path discovery compatible with Geant4 11.1.1
 
 * 2023-04-25 Andre Sailer ([PR#1097](https://github.com/aidasoft/DD4hep/pull/1097))
   - Geant4InputHandling: in case the MC generator gives us a negative mass, the proper_time_precision could be negative and we would not identify properTimeZero correctly. Fixes parts of #1094 when ddg4 smearing is used.
 
 * 2023-04-21 scott snyder ([PR#1093](https://github.com/aidasoft/DD4hep/pull/1093))
   - ddsim: Fix handling of --meta.runNumberOffset and --meta.eventNumberOffset command-line switches.
 
 * 2023-04-21 Frank Gaede ([PR#1088](https://github.com/aidasoft/DD4hep/pull/1088))
   - fix units in `Geant4FastSimShowerModel::constructSensitives`
        - used for energy check in `Geant4FastSimShowerModel::check_trigger`  for fast simulation
 
 * 2023-04-21 Andre Sailer ([PR#1074](https://github.com/aidasoft/DD4hep/pull/1074))
   - DDSim: add explicit configuration of the Geometry construction, exposing many debug options for elements, materials, volumes, shapes, placements, Reflections, Regions, and Surfaces. See ddsim --help or --dumpSteeringFile
 
 * 2023-03-31 Markus Frank ([PR#1087](https://github.com/aidasoft/DD4hep/pull/1087))
   - Improve plugin information
   -  inline in StandardPlugins.cpp and ShapePlugins.cpp
   - In DD4hep manual
 
 * 2023-03-30 Andre Sailer ([PR#1086](https://github.com/aidasoft/DD4hep/pull/1086))
   - HepMC3: use all vertex information to create primary vertices, including time, fixes #1082
 
 * 2023-03-29 Markus Frank ([PR#1084](https://github.com/aidasoft/DD4hep/pull/1084))
   - Upgrade standard plugins. Add some help information
 
 * 2023-03-29 Markus Frank ([PR#1083](https://github.com/aidasoft/DD4hep/pull/1083))
   - Add plugin to assign VolumIDs to DetElements
     Normally this functionality id done by the VolumeManager. However, some clients prefer to not use the volume manager.
     With this plugin this basic functionality can be maintained.
   - Update plugin DD4hep_DetectorDump to optionally output the accumulated volume identifiers when traversing 
     the DetElement tree.
   
   To test both, invoke e.g.:
   ```
   $> geoPluginRun -input ../DD4hep/DDDetectors/compact/SiD.xml \
        -plugin DD4hep_DetElementVolumeIDs -detector /world \
        -plugin DD4hep_DetectorDump -sensitive -volids
   ```
 
 * 2023-03-23 Markus Frank ([PR#1081](https://github.com/aidasoft/DD4hep/pull/1081))
   Allow users to add track user information to G4 tracks, which then moves to Geant4Particle for saving
   Use class Geant4ParticleInformation to extend the Geant4Particle object.
   Wrapper to store any user information as a `G4VUserTrackInformation` in a `G4Track`.
       The data of type `ParticleExtension` is moved from the `G4Track` to the `Geant4Particle` in the `Geant4ParticleHandler` if present. This automatically make the `G4Track` instance persistent as a `Geant4Particle`.
   Hence: Be careful to not assign the entity by default!
   
   The data in the subclass of `ParticleExtension` defined by the user
   requires a dictionary to be stored to ROOT.
   
   - Example: examples/DDG4_MySensDet. See examples/DDG4_MySensDet/src/MyTrackerSDAction.cpp for details.
   - Great thanks to ROOT for now being able to store std::unique_ptr<T>!
   - This is sort of a sub-issue to https://github.com/AIDASoft/DD4hep/issues/1073
 
 * 2023-03-23 Christopher Dilks ([PR#1069](https://github.com/aidasoft/DD4hep/pull/1069))
   - rename `OpticalTracker` example to `RICH`
 
 * 2023-03-22 Markus Frank ([PR#1080](https://github.com/aidasoft/DD4hep/pull/1080))
   - Fix bug in B field component access after a space transformation of multipole fields.
     See issue  MultipoleMagnet rotation #1073 https://github.com/AIDASoft/DD4hep/issues/1073 for details.
 
 * 2023-03-22 Markus Frank ([PR#1079](https://github.com/aidasoft/DD4hep/pull/1079))
   - Optimize sensitive detector callbacks in DDG4.
     Many operations were performed twice: once in the sensitive detector, and once again in the computation of
     the MC contribution to the hit. This MR removes multiple computations and uses the results from the MC
     contribution to create the hit.
     The change should be fully compatible and delivers numerically identical results.
   
   - Remove deprecated DetElement factories.
     To not clutter the global namespace with factory names, factories in the DDDetectors area were declared
     deprecated many years ago. At a time these factories were replaced by identical factoris with a name prefix "DD4hep_".
     These factories are "official" and should be used instead.
     On creation such factories issued a warning message.
     It is now time to remove these factories completely.
 
 * 2023-03-21 Christopher Dilks ([PR#1065](https://github.com/aidasoft/DD4hep/pull/1065))
   - Add test for average energy deposition in `OpticalTracker` example, for `Geant4SensitiveAction<Geant4OpticalTracker>`
 
 * 2023-03-15 Markus Frank ([PR#1078](https://github.com/aidasoft/DD4hep/pull/1078))
   - See issue 1076 https://github.com/AIDASoft/DD4hep/issues/1076
 
 * 2023-03-15 Wouter Deconinck ([PR#1075](https://github.com/aidasoft/DD4hep/pull/1075))
   - ddsim: Support for setting etaMin and etaMax. These override the respective theta settings!
 
 * 2023-03-03 Markus Frank ([PR#1071](https://github.com/aidasoft/DD4hep/pull/1071))
   -  Verify and enhance the possibility to import plugin definitions from an external XML file
     (See isue: https://github.com/AIDASoft/DD4hep/issues/1062).
     The corresponding examples are:
     -- minitel_config_plugins_include_command_line, which shows how to perform the task by parsing sequentially the 
        XML input files like: 
        ```
        $> geoPluginRun -input <path>/compact/MiniTel.xml  -input  <path>/compact/ExamplePlugins.xml
       ```
     -- minitel_config_plugins_include_command_xml, where the second XML file is simply included:
   
         <includes>
           <file ref=<path>/examples/ClientTests/compact/BoxTrafos.xml/>
           <file ref=<path>/examples/ClientTests/compact/ExamplePlugins.xml/>
         </includes>
      where `BoxTrafos` is the entire original XML containing the geometry.
   -  Add plugins: configure Volume/SensitiveDetector object instances from information in XML Nodes. Given an XML tag like:
      ```
       <plugin type="config" name="DD4hep_DetElementConfig" path="/world" debug="true">
         <volume>
            <regionref   name="world_region"/>
            <limitsetref name="world_limits"/>
            <visref      name="world_vis"/>
         </volume>
       </plugin>```
   Can be used directly to modify the settings of s DetElement identified by its path. Similar for sensitive detector objects:
   ```
       <plugin type="config" name="DD4hep_SensitiveDetectorConfig" detector="MyLHCBdetector5" debug="true">
         <combine_hits    value="true"/>
         <verbose         value="true"/>
         <type            value="tracker"/>
         <ecut            value="5*keV"/>
         <hits_collection value="hits_collection_5"/>
       </plugin>
   ```
   - This construct also allows to configure the world volume as part of the resolution of issue https://github.com/AIDASoft/DD4hep/issues/1064
      ```
     <world debug="true">
       <regionref   name="world_region"/>
       <limitsetref name="world_limits"/>
       <visref      name="world_vis"/>
     </world> 
      ```
     Technically the implementation are XML utilities, which are used both by the plugin and the Compact converter.
   
   - Propagate the changes to the world volume to Geant4, which was not possible with DDG4 before, because production cuts and region settings for the world volume belong to Geant4 and are managed by Geant4. (also https://github.com/AIDASoft/DD4hep/issues/1064)
   - Side product: Add debug flags for the G4 LimitSet conversion. To enable the flags in the python setup:
   
     ```
       seq, act = m.geant4.addDetectorConstruction("Geant4DetectorGeometryConstruction/ConstructGeo")
       act.DebugLimits = True
      ```
   - Have the maps in DetectorData being named to ease debugging.
   - Add some XML attribute conversions (more user friendliness)
   - Add accessors to the PlacedVolume and the Volume handles to access the class name of the implementing class.
   - DDDigi: Add passing event parameters to the output and from the input record to the store. Needs testing though, 
     but this requires a new release of podio.
 
 * 2023-03-02 Markus Frank ([PR#1070](https://github.com/aidasoft/DD4hep/pull/1070))
   - PR 1068 was incomplete (OpticalTracker). Add the missing pieces.
 
 * 2023-03-01 Christopher Dilks ([PR#1068](https://github.com/aidasoft/DD4hep/pull/1068))
   - fix: fill energy deposition for `Geant4SensitiveAction<Geant4OpticalTracker>`
 
 * 2023-03-01 Markus Frank ([PR#1066](https://github.com/aidasoft/DD4hep/pull/1066))
   - Add include directive in <plugins> section
     (https://github.com/AIDASoft/DD4hep/commit/43b66bfd145c9e58c91f2189c2a3671ef9b2ef8e)
     See Issue 1062 (https://github.com/AIDASoft/DD4hep/issues/1062)
   - With test: /examples/ClientTests/compact/IncludePlugins.xml
   - Some (mostly cosmetic) refactorization in DDDigi
 
 # v01-25-01
 
 * 2023-02-24 Andre Sailer ([PR#1063](https://github.com/aidasoft/dd4hep/pull/1063))
   * DDG4: fix -Wnon-pod-varargs in Geant4Output2EDM4hep, which fails on clang
 
 # v01-25
 
 * 2023-02-23 Thomas Madlener ([PR#1059](https://github.com/aidasoft/dd4hep/pull/1059))
   - Propagate HepMC event weights to EDM4hep and LCIO outputs of ddsim
     - Store all available weights and their names into the Frame / Event parameters, additionally store the first weight into the `weight` field of the `edm4hep::EventHeader`, resp. the `LCEvent`.
   - Add a possibility to store `double` values in `DDG4::EventParameters`
 
 * 2023-02-23 Andre Sailer ([PR#920](https://github.com/aidasoft/dd4hep/pull/920))
   - DDG4: Geant4InputHandling: Try to address the simulation of Excited Ions. Print a warning if we encounter excited Ions that Geant4 cannot handle. Waiting for something else to provide the excitation energy information that is needed in this case. Fixes #918 and #1051 
   - DDSim: Catch and log exceptions for physics/userFunctions.
 
 * 2023-02-21 Ben Couturier ([PR#1060](https://github.com/aidasoft/dd4hep/pull/1060))
   - Prevent a compact file from being loaded twice if the debug option "incguard" has been set.
 
 * 2023-02-16 Andre Sailer ([PR#1061](https://github.com/aidasoft/dd4hep/pull/1061))
   - ddsim: make it possible to use batchmode with userInputPlugins only
 
 * 2023-02-09 Markus Frank ([PR#1058](https://github.com/aidasoft/dd4hep/pull/1058))
   The export of dd4hep::units is problematic in the presence of identical libraries from DD4hep in the LD_LIBRARY_PATH:
   - The ROOT auto-class loading tends to falsely load these libraries if constants from the dd4hep namespace are requested in python. This is clearly wrong: the original libraries may not be binary compatible. The 
   - The export of the units using a helper class fixes this and ensures that the auto load mechanism is not automatically triggered. This is at least a formally correct solution until the auto load mechanism is better understood.
   
   - In the ROOT loader for DDDigi the `TBranch::SetAutoDelete(true)` was not set causing eventually double deletion and arbitrary crashes. Data read by DDDigi are put on the store and deleted by the application to allow subsequent reading for feeding other threads. If ROOT would take care of the deletion, multi-threaded processing is not possible.
 
 * 2023-02-06 Dmitry Kalinkin ([PR#1055](https://github.com/aidasoft/dd4hep/pull/1055))
   - Pass `DYLD_LIBRARY_PATH` environment to listcomponents_dd4hep when generating rootmaps in CMake
 
 * 2023-01-31 Paul Gessinger ([PR#1053](https://github.com/aidasoft/dd4hep/pull/1053))
   - Check podio version for compatibility in cmake
 
 * 2023-01-30 Dmitry Kalinkin ([PR#1052](https://github.com/aidasoft/dd4hep/pull/1052))
   - Removed not implemented declaration of member function `PlacedVolume::flags()`
 
 * 2023-01-26 Thomas Madlener ([PR#1050](https://github.com/aidasoft/dd4hep/pull/1050))
   - DDG4 EDM4hep Output: Write Frames into the `"runs"` category of the output file to store some run information.
 
 # v01-24
 
 * 2023-01-20 Andre Sailer ([PR#1048](https://github.com/AIDASoft/DD4hep/pull/1048))
   - add -Wno-psabi to compiler flags to ignore warnings about ABI changes that we will never have issues with. Fixes #1043
 
 * 2023-01-20 Andre Sailer ([PR#1046](https://github.com/AIDASoft/DD4hep/pull/1046))
   - ParticleHandler: account for modified stepping actions, where tracking of a particle could be paused and later restarted.
 
 * 2023-01-18 Andre Sailer ([PR#1045](https://github.com/AIDASoft/DD4hep/pull/1045))
   - thisdd4hep: fix an issue with environment paths getting dropped when they contain a complete substring of a path that is going to be added
 
 * 2023-01-18 Markus Frank ([PR#1044](https://github.com/AIDASoft/DD4hep/pull/1044))
   - This PR addresses issue https://github.com/AIDASoft/DD4hep/issues/1037
     Rather than adding the beta as a double it was chosen to add at each step the track momentum
     in floats which for 4 more bytes offers more information.
 
 * 2023-01-18 Andre Sailer ([PR#1042](https://github.com/AIDASoft/DD4hep/pull/1042))
   - ddsim: fix exception when a compactFile path not containing any slashes was given (fixes #1039 )
 
 * 2023-01-17 Markus Frank ([PR#1041](https://github.com/AIDASoft/DD4hep/pull/1041))
   - Make DDDigi I/O interface more common and add edm4hep write/read example
   - Move DDG4 edm4hep writer to use podio Frames
 
 * 2023-01-11 Markus Frank ([PR#1038](https://github.com/AIDASoft/DD4hep/pull/1038))
   - Improve DDDigi documentation when opening code sub-page
   - Silence flak8 warning from python
   - Fix a bug in the detector checksum module. Tested with TGeo units and G4 units of the CLICSiD model.
   - Propagate the configuration flag `DD4HEP_USE_EDM4HEP` to the generated dd4hep cmake of client projects.
   - Add DDDigi output module for the edm4hep format
   - Add DDDigi output module for the native ROOT objects including required dictionaries.
 
 * 2022-12-15 Markus Frank ([PR#1032](https://github.com/AIDASoft/DD4hep/pull/1032))
   - Improve GDML export procedures
     -- Allow to set export precision in the plugin
     -- New ROOT release needed to properly export surfaces (current ROOT GDML export does not handle this currectly)
        See ROOT PR https://github.com/root-project/root/pull/11886
        See ROOT PR https://github.com/root-project/root/pull/11887
        See ROOT PR https://github.com/root-project/root/pull/11888
        See ROOT PR https://github.com/root-project/root/pull/11889
        See ROOT PR https://github.com/root-project/root/pull/11895
   - Remove some build errors for MAC
 
 * 2022-12-09 Markus Frank ([PR#1030](https://github.com/AIDASoft/DD4hep/pull/1030))
   - Program GDML writer (requires new ROOT release to take advantage)
 
 * 2022-12-09 Markus Frank ([PR#1029](https://github.com/AIDASoft/DD4hep/pull/1029))
   - Improve DDDigi package doc
   - Bug fix in detector checksum
   - Remove flak8 warnings
 
 * 2022-12-06 Markus Frank ([PR#1028](https://github.com/AIDASoft/DD4hep/pull/1028))
   - Add detector checksum facility as plugin: Compare different detector setups
   - Gives identical hash results for TGeo units and G4 units
   - Supports detector dumps with "unified" strings for debugging
   ```
   Usage: -plugin DD4hepDetectorChecksum -arg [-arg]                             
   
        -detector <string>     Top level DetElement path. Default: '/world'        
        -readout               also hash the detector's readout properties         
                               (sensitive det, id desc, segmentation)              
                               default: false                                      
                                                                                   
      Debugging: Dump individual hash codes (debug>=1)                             
      Debugging: and the hashed string (debug>2)                                   
        -dump_elements         Dump hashes of used elements                        
        -dump_materials        Dump hashes of used materials                       
        -dump_solids           Dump hashes of used solids                          
        -dump_volumes          Dump hashes of used volumes                         
        -dump_placements       Dump hashes of used placements                      
        -dump_detelements      Dump hashes of used detelements                     
        -dump_sensitive        Dump hashes of sensitive detectors                  
        -dump_readout          Dump hashes of readout entities                     
        -dump_iddescriptors    Dump hashes of ID descriptors                       
        -dump_segmentations    Dump hashes of readout segmentations                
                                                                                   
      Modify units in the created hash strings (deprecated):                       
        -length_unit  <value>  Unit of length  as literal. default: mm             
        -angle_unit   <value>  Unit of angle   as literal. default: deg            
        -energy_unit  <value>  Unit of energy  as literal. default: GeV            
        -density_unit <value>  Unit of density as literal. default: g/cm3          
        -atomic_unit <value>   Unit of atomic weight as literal. default: g/mole   
                                                                                   
        -debug <number>        Enable debug printouts.                             
        -help                  Print this help output
   ```
 
 * 2022-11-30 Kolja Kauder ([PR#1017](https://github.com/AIDASoft/DD4hep/pull/1017))
   - Final state HepMC particles were all attached to (0,0,0). Fixed by switching vertex creation for parentless particles to using their end-point instead, fixes #1013
 
 * 2022-11-26 Markus Frank ([PR#1026](https://github.com/AIDASoft/DD4hep/pull/1026))
   - Fixed some coverity defects recently reported
   - Fix Geant4Converter bug: Protect for reflected assembly shapes.
   - Added feature to Geant4Output2ROOT to change file when the run number changes (ie. for each /run/beamOn command)
   - Modify and enhance the MiniTel example in ClientTests to serve as a small, but flexible testbed for DDDigi
   - Add multiple DDDigi tests using the modified MiniTel
     o Data generator using DDG4
     o See examples/DDDigi/scripts for the tests:
        o multiple interactions
        o spillover events
        o Container parallelization
        o Segmentation parallization
   - Started to implement a checksum mechanism based on well formatted XML dumps similar to GDML, but with
     well defined floating point precision.
     o See https://github.com/AIDASoft/DD4hep/issues/994 for details
     o first and incomplete dump for shapes.
     o to be completed eventually
     o whoever feels like it can become involved to implement such dumps for other objects:
       - elements, isotopes, materials, DetElements, Volumes, Placements etc.
 
 * 2022-11-25 jmcarcell ([PR#1024](https://github.com/AIDASoft/DD4hep/pull/1024))
   - Fix compiler warning about unused variable
   - Fix warning in example test and fix also the test, it was comparing `char* == char*` which is almost never true
 
 * 2022-11-24 Wouter Deconinck ([PR#1012](https://github.com/AIDASoft/DD4hep/pull/1012))
   - DDG4: Geant4TCUserParticleHandler: Allow for asymmetric tracking region with `tracker_region_zmin`
 
 * 2022-11-22 Markus Frank ([PR#1023](https://github.com/AIDASoft/DD4hep/pull/1023))
   Take into account suggestions from PR https://github.com/AIDASoft/DD4hep/pull/1021
 
 * 2022-11-22 Markus Frank ([PR#1021](https://github.com/AIDASoft/DD4hep/pull/1021))
   - Implemented issue https://github.com/AIDASoft/DD4hep/issues/1010: Changing Geant4 physics flags 
     o Extended the Geant4UIManager to support command queues at various stages of the program:
       -- configure
       -- initialize
       -- pre-run
       -- post-run
       -- terminate
     o Added interface function to directly communicate with the G4UI using string commands at any time
       from python.
     o Extended Geant4Kernel functionality to allow client actions to subscribe to stages of the program
       and perform dedicated actions on:
       -- configure
       -- initialize
       -- terminate
       As an example please see DDG4/src/Geant4UIManager.cpp
   
   - Dropped issue https://github.com/AIDASoft/DD4hep/issues/1004 after some tests and investigation:
     This issue cannot be resolved, because MC records may also be read without Geant4 and a physics list being initialized.
     Hence the event readers cannot implement such a feature if the event record does not support charge, but only the PDG code.
     Conclusion is to best update the charge of particles at the output stage using the PDG code or to implement an event action,
     which performs this actions right before the output stage.
   - Simplified component properties. 
   - Improvements to DDDigi (work in progress)
 
 * 2022-11-17 Andre Sailer ([PR#1019](https://github.com/AIDASoft/DD4hep/pull/1019))
   - LCIOConversions: fix attaching SimCaloHit collections to event, this was accidentally dropped in #922
 
 * 2022-11-16 Jonas Hahnfeld ([PR#1018](https://github.com/AIDASoft/DD4hep/pull/1018))
   - Fix build with GCC 8
 
 * 2022-11-11 Wouter Deconinck ([PR#1011](https://github.com/AIDASoft/DD4hep/pull/1011))
   - Allow HepMC3 ROOT input files in ddsim when they end with `.hepmc3.tree.root`
 
 * 2022-11-10 Wouter Deconinck ([PR#989](https://github.com/AIDASoft/DD4hep/pull/989))
   - ddsim: Automatically interpret '.hepmc3' input files
 
 * 2022-11-03 Andre Sailer ([PR#1005](https://github.com/AIDASoft/DD4hep/pull/1005))
   - Examples: OpticalTracker: declare dependency on DDRec
   - Docs: fix some typos noted in #1003
 
 * 2022-10-30 Markus Frank ([PR#1002](https://github.com/AIDASoft/DD4hep/pull/1002))
   - Fix to issue https://github.com/AIDASoft/DD4hep/issues/1000 and https://github.com/AIDASoft/DD4hep/issues/999
 
 * 2022-10-29 Markus Frank ([PR#998](https://github.com/AIDASoft/DD4hep/pull/998))
   - DDCore
     -- Add string hash function for 8 and 16 bit hash results
     -- Add position transformations (world, detector element) to volume manager
   
   - DDG4
     -- Fix interface to Geant4StackingAction. Add missing function interface to allow access to ClassifyNewTrack.
        Also pass the current stacking manager reference to all user callbacks.
     -- Add simple example to test the functionality  examples/DDG4/scrips/TestStacking.py
   
   - DDDigi
     -- Add some processor plugins for simple data processing.
     -- Enhance the usage of the Key identifier.
     -- Add several test scripts in the example area.
   
   - examples
     -- Reduce the test execution time of the top CPU consumers by reducing the number of simulated events.
 
 * 2022-10-24 Paul Gessinger ([PR#997](https://github.com/AIDASoft/DD4hep/pull/997))
   - DD4HEP_RELAX_PYVER is exported to `DD4hepConfig.cmake`.
 
 * 2022-10-22 Andre Sailer ([PR#996](https://github.com/AIDASoft/DD4hep/pull/996))
   - DDSim: fix bug preventing the use of integers for the verbosity level (-v/--printLevel, --output.input etc.) fixes #992
 
 * 2022-10-17 Andre Sailer ([PR#987](https://github.com/AIDASoft/DD4hep/pull/987))
   - DDEve: Adapt to renamed header in upcoming ROOT 6.28
 
 * 2022-10-17 Wouter Deconinck ([PR#986](https://github.com/AIDASoft/DD4hep/pull/986))
   - Shapes::Trap: Fix the 4-argument trapezoidal prism constructor (again)
 
 * 2022-10-10 Wouter Deconinck ([PR#983](https://github.com/AIDASoft/DD4hep/pull/983))
   - Ensure that closed tessellated solids are converted to closed solids in geant4
 
 # v01-23
 
 * 2022-09-28 Wouter Deconinck ([PR#982](https://github.com/aidasoft/dd4hep/pull/982))
   - ddsim: set eta_min, eta_max correctly for `ddsim --gun.distribution eta`
 
 * 2022-09-23 Markus Frank ([PR#980](https://github.com/aidasoft/dd4hep/pull/980))
   Remove using declarations in root-cling dictionary files to avoid interpreter clashes with the global namespace
   
   Affected files:
   -   DDCore/src/GeoDictionary.h
   -   DDCore/src/PropertyDictionary.h
   -   DDCore/src/RootDictionary.h
   -   DDCore/src/SegmentationDictionary.h
   -   DDEve/include/DDEve/Dictionary.h
   -   DDG4/include/DDG4/DDG4Dict.h
 
 * 2022-09-23 Marco Clemencic ([PR#979](https://github.com/aidasoft/dd4hep/pull/979))
   - Use explicit namespaces in DDCond dictionary
 
 * 2022-09-19 Wouter Deconinck ([PR#976](https://github.com/aidasoft/dd4hep/pull/976))
   - `geoConverter -compact2tgeo` to write TGeo geometry to ROOT file
 
 * 2022-09-19 Christopher Dilks ([PR#974](https://github.com/aidasoft/dd4hep/pull/974))
   - add example RICH detector, demonstrating and testing `Geant4OpticalTrackerAction`
 
 * 2022-09-16 Wouter Deconinck ([PR#975](https://github.com/aidasoft/dd4hep/pull/975))
   - materialBudget: enable use with asymmetric detectors: adding thetaMin/thetaMax/etaMin to the steering file
 
 * 2022-09-15 Wouter Deconinck ([PR#967](https://github.com/aidasoft/dd4hep/pull/967))
   - Geant4OpticalTrackerAction which stops-and-kills optical photons for e.g. SiPM sensor planes
 
 * 2022-09-12 Christopher Dilks ([PR#973](https://github.com/aidasoft/dd4hep/pull/973))
   - fix typo in `examples/README.md`: `cmake` option `DD4HEP_BUILD_EXAMPLES` should be `DD4HEP_EXAMPLES`
 
 * 2022-09-07 Dmitry Kalinkin ([PR#972](https://github.com/aidasoft/dd4hep/pull/972))
   - Refactor thisdd4hep.sh to use local variables where possible to prevent user environment corruption.
 
 * 2022-09-01 Andre Sailer ([PR#969](https://github.com/aidasoft/dd4hep/pull/969))
   - DDSim: ddsim now prints out if the defaultFilter or if no filter is used for a sensitive detector
 
 * 2022-09-01 Wouter Deconinck ([PR#968](https://github.com/aidasoft/dd4hep/pull/968))
   - ddsin: Add `--runType qt` support for enabling the graphical Qt interface for geant4
   - ddsim: change shell type to tcsh: enabling tab completion when Geant4 offers it
 
 * 2022-08-26 Andre Sailer ([PR#962](https://github.com/aidasoft/dd4hep/pull/962))
   - DDCore: DetectorInfo: make INFO attributes optional, fixes #960
 
 * 2022-08-25 Andre Sailer ([PR#963](https://github.com/aidasoft/dd4hep/pull/963))
   - ChannelingCrystalMaterial: fix crystal_orientation to be constPropertyRef
 
 * 2022-08-25 Andre Sailer ([PR#961](https://github.com/aidasoft/dd4hep/pull/961))
   - DDSim: fix example for adding user physics list extension
 
 # v01-22
 
 * 2022-08-16 Andre Sailer ([PR#957](https://github.com/aidasoft/dd4hep/pull/957))
   - CI: add check for header guards
 
 * 2022-08-15 Andre Sailer ([PR#956](https://github.com/aidasoft/dd4hep/pull/956))
   - CI: Add test with Geant4Units enabled
 
 * 2022-08-15 Andre Sailer ([PR#946](https://github.com/aidasoft/dd4hep/pull/946))
   - CI changes, for discussion
 
 * 2022-08-11 Markus Frank ([PR#954](https://github.com/aidasoft/dd4hep/pull/954))
   Before starting to parse XML files, programatically set the locale to "C" if any of the three
   - LC_NUMERIC,
   - LC_TIME,
   - LC_CTYPE
   Is not set to "C".
   
   Addresses issue https://github.com/AIDASoft/DD4hep/issues/913.
 
 * 2022-08-11 Andre Sailer ([PR#953](https://github.com/aidasoft/dd4hep/pull/953))
   - DDSim: find the python executable used during build and set that for the hashbang, e.g. python3.9 instead of python. Fixes #952
 
 * 2022-08-10 Markus Frank ([PR#951](https://github.com/aidasoft/dd4hep/pull/951))
   - Allow to set MeanExcEnergy, MeanEnergyPerIonPair and BirksConstant in G4Materials ionisation parameters.
     Specify values in the compact description of the materials:
   ```
       <material name="Ice">
         <D type="density" value="1.0" unit="g/cm3"/>
         <composite n="2" ref="H"/>
         <composite n="1" ref="O"/>
         <constant name="BirksConstant"        value="123.456*mm/MeV"/>
         <constant name="MeanExcitationEnergy" value="79.7*eV"/>
         <constant name="MeanEnergyPerIonPair" value="50*eV"/>
       </material>
   ```
   Units will be converted to Geant4 units in the converter.
   See issue https://github.com/AIDASoft/DD4hep/issues/890 for details.
   
   If in DDG4 the the material debugging is enabled:
   ```
     # Configure G4 geometry setup
     seq, act = geant4.addDetectorConstruction("Geant4DetectorGeometryConstruction/ConstructGeo")
     act.DebugMaterials = True
   ```
   this gives the following output:
   ```
   Ice                    ++ Created G4 material  Material:      Ice    density:  1.000 g/cm3   RadL:  36.083 cm   Nucl.Int.Length:  75.375 cm 
                         Imean:  79.700 eV   temperature: 293.15 K  pressure:   1.00 atm
   
      --->  Element: H (H)   Z =  1.0   N =     1   A =  1.008 g/mole
            --->  Isotope:    H1   Z =  1   N =   1   A =   1.01 g/mole   abundance: 99.989 %
            --->  Isotope:    H2   Z =  1   N =   2   A =   2.01 g/mole   abundance:  0.011 %
             ElmMassFraction:  11.19 %  ElmAbundance  66.67 % 
   
      --->  Element: O (O)   Z =  8.0   N =    16   A = 15.999 g/mole
            --->  Isotope:   O16   Z =  8   N =  16   A =  15.99 g/mole   abundance: 99.757 %
            --->  Isotope:   O17   Z =  8   N =  17   A =  17.00 g/mole   abundance:  0.038 %
            --->  Isotope:   O18   Z =  8   N =  18   A =  18.00 g/mole   abundance:  0.205 %
             ElmMassFraction:  88.81 %  ElmAbundance  33.33 % 
             log(MEE): -9.437  Birk's constant: 123.5 [mm/MeV]  Mean Energy Per Ion Pair: 50 [eV]
   ```
 
 * 2022-08-10 Markus Frank ([PR#950](https://github.com/aidasoft/dd4hep/pull/950))
   On request from out LHC colleagues DD4hep supports channeling physics in Geant4.
   To support channeling physics in Geant4 it is necessary to enable the transparent 
   creation of G4ExtendedMaterial and G4LogicalCrystalVolume instances.
   This can be done in DD4hep with the supply of material and volume properties in DD4hep.
   
   Material properties can be supplied in the compact description like here:
   ```
       <material name="Ice">
         <D type="density" value="1.0" unit="g/cm3"/>
         <composite n="2" ref="H"/>
         <composite n="1" ref="O"/>
         <constant name="Geant4-plugin:material"            option="ChannelingCrystalMaterial"/>
         <constant name="Geant4-ignore:crystal_data"        option="${DD4hepExamplesINSTALL}/examples/DDG4/data/Si220pl/Si220pl"/>
         <constant name="Geant4-ignore:crystal_orientation" option="(1,0,0)"/>
       </material>
   ```
   The property starting with the tag `Geant4-plugin` is used to determine the proper plugin
   preparing the G4ExtendedMaterial instance.
   All properties with tags `Geant4-ignore` are not passed as material properties to Geant4.
   Properties starting with this tag can be used by users to configure the G4ExtendedMaterial instance.
   
   Volumes can as well have properties as this C++ example shows:
   ```
     Volume vol = Volume("Volume", solid, material);
     xml_elt_t ec = ...;
     vol.addProperty(ec.attr<std::string>(_U(name)), ec.attr<std::string>(_U(value)));
   ```
   with values supplied by XML:
   ```
     <property name="Geant4-plugin" value="ChannelingCrystalVolume"/>
   ```
   For more details see the example `<DD4hep>/examples/DDG4/compact/Channeling.xml`.
   Again the property `Geant4-plugin` is used to call a plugin to create sub-classes
   of G4LogicalVolume like G4LogicalCrystalVolume. 
   
   An example was prepared in `<DD4hep>/examples/DDG4` containing:
   - a compact description: `compact/Channeling.xml`
   - an example factory for the G4ExtendedMaterial: `src/ChannelingCrystalMaterial.cpp`
   - an example factory for the G4LogicalCrystalVolume: `src/ChannelingCrystalVolume.cpp`
   - A script invoking Geant4 to test this setup: `scripts/Channeling.py`
 
 * 2022-08-09 Dmitry Kalinkin ([PR#949](https://github.com/aidasoft/dd4hep/pull/949))
   - DDSim: restore the fixed momentum behaviour of `--gun.energy`, independent of the isotrop setting for the particle gun. If gun.energy is set, the momentum will have this value. If it is not set, momentumMin and momentumMax will be used to pick a value.
 
 * 2022-08-05 Andre Sailer ([PR#942](https://github.com/aidasoft/dd4hep/pull/942))
   - DDSim: add option to set userInputPlugin for simulation by adding a plugin for themselves, and this to the ddsim steering file (for #940)
      ```python
         def exampleUserPlugin(dd4hepSimulation):
           '''Example code for user created plugin.
   
           :param DD4hepSimulation dd4hepSimulation: The DD4hepSimulation instance, so all parameters can be accessed
           :return: GeneratorAction
           '''
           from DDG4 import GeneratorAction, Kernel
           # Geant4InputAction is the type of plugin, Cry1 just an identifier
           gen = GeneratorAction(Kernel(), 'Geant4InputAction/Cry1' , True)
           # CRYEventReader is the actual plugin, steeringFile its constructor parameter
           gen.Input = 'CRYEventReader|' + 'steeringFile'
           # we can give a dictionary of Parameters that has to be interpreted by the setParameters function of the plugin
           gen.Parameters = {'DataFilePath': '/path/to/files/data'}
           gen.enableUI()
           return gen
   
         SIM.inputConfig.userInputPlugin = exampleUserPlugin
      ```
 
 * 2022-08-04 Andrea Ciarma ([PR#944](https://github.com/aidasoft/dd4hep/pull/944))
   * Mask_o1: Added the possibility to have sensitive elements of type Mask_o1_v01_geo by adding a `sensitive="sensitiveType"` attribute
 
 * 2022-08-02 Juraj Smiesko ([PR#941](https://github.com/aidasoft/dd4hep/pull/941))
   * checkOverlaps.py: Adding possibility to provide multiple compact files
   * checkOverlaps.py: replace optparse by argparse for up-to-date python
 
 * 2022-08-01 Markus Frank ([PR#939](https://github.com/aidasoft/dd4hep/pull/939))
   - Follow up of https://github.com/AIDASoft/DD4hep/pull/938. 
     Improves the DetectorCheck plugin.
   - Add example with an "ill" detector description that triggers the DetectorCheck plugin
     to complain and to eject pathes to problematic detector elements ect.
 
 * 2022-07-29 Markus Frank ([PR#938](https://github.com/aidasoft/dd4hep/pull/938))
   - Fix type in DDCore/src/DD4hepRootPersistency.cpp
   - Add operator== and operator != to handles of DetElement, SensitiveDetector
     Volume and PlacedVolume. Check pointer values for equality.
   - Add plugin DD4hep_DetectorCheck. Improves and replaces DD4hep_VolumeMgrTest.
     o Test checks the strutural tree of a given top element
     o Test checks the geometry tree of a given top element
     o If physical volume ids are properly placed these can also be checked.
   ```
   DD4hep_DetectorCheck -option [-option]                                         
     -help                        Print this help message                         
     -name  <subdetector name>    Name of the subdetector to be checked           
                                  "ALL" or "all": loop over known subdetectors
                                  "world" start from the mother of all...       
     -structure                   Check structural tree consistency               
     -geometry                    Check geometry tree consistency                 
     -sensitve                    Check consistency between detector and volume   
                                  settings of sensitive detectors.                
     -volmgr                      Check volume manager entries against volIDs of  
                                  sensitive volume placements.                  
   
                                  NOTE: Option requires proper PhysVolID setup    
                                  of the sensitive volume placements !
   ```
 
 * 2022-07-27 Juraj Smiesko ([PR#937](https://github.com/aidasoft/dd4hep/pull/937))
   - Improving error message when setting detector type flags
 
 * 2022-07-27 Andre Sailer ([PR#935](https://github.com/aidasoft/dd4hep/pull/935))
   - ddsim: Fix setting of zeroTimePDGs, previously this value was not forwarded from config to the program
   - particle.tbl: change 523 to unstable (fixes #909)
   - Geant4InputHandling: add exception when encountering stable particles with daughters that are marked for simulation (implements feature of #909)
   - Geant4InputHandling: reject particles with GEN_DOC, GEN_BEAM, GEN_OTHER (fixes part of #918)
 
 * 2022-07-26 Markus Frank ([PR#936](https://github.com/aidasoft/dd4hep/pull/936))
   - Recursive calls to apply-plugins overwrote the return code.
   - This MR fixes issue https://github.com/AIDASoft/DD4hep/issues/875
   
   - Support for 1D, 2D and 3D parameterised volumes.
     (Outstanding request by S.Ko)
     1. TGeo does not support parametrized volumes intrinsically.
       On the dd4hep/TGeo side these are implemented by multiple placements 
       according to the user supplied transformation matrices.
       For details see the calls in `dd4hep::Volume::paramVolume<dim>D(...)`
     2. When translated to Geant4, the structures are identified and
       the proper Geant4 parameterisation is created.
     3. An example can be found in:
       - `examples/ClientTests/src/ParamVolume_geo.cpp`
       - to display: `geoDisplay examples/ClientTests/compact/ParamVolume<dim>D.xml`
       - the Geant4 conversion is excercised with the scripts:
         ```
         python examples/ClientTests/scripts/ParamVolume.py \
            -geometry examples/ClientTests/compact/ParamVolume<dim>D.xml \
            -vis -macro examples/ClientTests/compact/ParamVolume.mac ```
 
 # v01-21
 
 * 2022-07-19 Markus Frank ([PR#933](https://github.com/aidasoft/DD4hep/pull/933))
   The fast simulation handling in Geant4 includes the GFlash interface
   as implemented in `<geant40-source>/source/parameterisations/gflash`
   and a fast simulation interface as provided by 
   `<geant40-source>/source/processes/parameterisation`
   
   This MR allows to handle both mechanisms using the same callbacks 
   in the Geant4SensitiveActions using the callback specialization:
   ```
         /// GFLASH/FastSim interface: Method for generating hit(s) using the information of the fast simulation spot object.
         virtual bool processFastSim(const Geant4FastSimSpot* spot, G4TouchableHistory* history)  final;
   ```
   in addition to the regular callback for full simulation:
   ```
         /// G4VSensitiveDetector interface: Method for generating hit(s) using the G4Step object.
         virtual bool process(const G4Step* step,G4TouchableHistory* history)  final;
   ```
   The `Geant4FastSimSpot` is inspired by the `G4GFlashSpot`, but avoids the specialization towards GFlash
   given that the `G4FastHit` and the `G4GFlashEnergySpot` are equivalent.
   Together with the helper class `Geant4FastSimHandler` simple sensitive detector callbacks
   can be implemented like:
   ```
       /// GFlash/FastSim interface: Method for generating hit(s) using the information of Geant4FastSimSpot object.
       template <> bool
       Geant4SensitiveAction<Geant4Tracker>::processFastSim(const Geant4FastSimSpot* spot,
                                                          G4TouchableHistory* /* hist */)
       {
         typedef Geant4Tracker::Hit Hit;
         Geant4FastSimHandler h(spot);
         Hit* hit = new Hit(h.trkID(), h.trkPdgID(), h.deposit(), h.track->GetGlobalTime());
         hit->cellID        = cellID(h.touchable(), h.avgPositionG4());
         hit->energyDeposit = h.deposit();
         hit->position      = h.avgPosition();
         hit->momentum      = h.momentum();
         hit->length        = 0e0;
         collection(m_collectionID)->add(hit);
         return true;
       }
   ```
   Callbacks with this signature are called both for GFlash and the G4 fast simulation.
   
   To simplify the user defined construction of fast simulation shower models
   the helper class `Geant4FastSimShowerModel` is implemented as a `Geant4Action`
   and hence allows to have options to be set by the user (including python).
   
   As an illustration two fast simulation shower models were implemented in
   `<dd4hep>/DDG4/plugins/Geant4P1ShowerModel.cpp` which were directly deduced
   from the Geant4 example `<geant4-source>/examples/extended/parameterisations/Par01`.
   Please see the source files for details.
   
   To execute GFlash or fast simulation to simple python examples are provided
   using simple silicon blocks as sensitive volumes:
   - GFlash `<dd4hep-dir>/examples/ClientTests/scripts/SiliconBlockGFlash.py`
   - Fast simulation `<dd4hep-dir>/examples/ClientTests/scripts/SiliconBlockFastSim.py`
   
   To enable either the following actions are required:
   1. Enable fast simulation for certain particles in the physics list:
   ```  # Build the physics list:
     phys = geant4.setupPhysics('FTFP_BERT')
     ph = DDG4.PhysicsList(kernel, str('Geant4FastPhysics/FastPhysicsList'))
     ph.EnabledParticles = ['e+', 'e-']
     ph.enableUI()
     phys.adopt(ph)
   ```
   This step is identical for GFlash and fast simulation physics.
   2. Enable the shower mode:
   ```  model = DDG4.DetectorConstruction(kernel, str('Geant4Par01EMShowerModel/ShowerModel'))
     # Mandatory model parameters
     model.RegionName = 'SiRegion'
     model.Material = 'Silicon'
     model.ApplicableParticles = ['e+', 'e-']
     model.Etrigger = {'e+': 0.1 * GeV, 'e-': 0.1 * GeV}
     model.Enable = True
     model.enableUI()
   ```
   Here the options must be set according to the parameters required by the shower models.
   
   The G4 fast simulation interface is only functional for Geant4 version >= 10.07.
   For lower versions of Geant4 missing classes are stubbed to allow the compilation.
 
 * 2022-07-18 Paul Gessinger ([PR#931](https://github.com/aidasoft/DD4hep/pull/931))
   - Update `VariantParameters`: `value_or` is const (returns by value anyway), add non-const `get` method
 
 * 2022-07-15 Markus Frank ([PR#930](https://github.com/aidasoft/DD4hep/pull/930))
   - Fix some handler
   - Add 2 examples to test the functionality
 
 * 2022-07-14 Markus Frank ([PR#929](https://github.com/aidasoft/DD4hep/pull/929))
   - First attempt to implement GFlash parametrization for DDG4
   - Example is in examples/ClientTests/scripts/SiliconBlockGFlash.py
     Relevant code changes are for the detector construction:
     ```
     seq, act = geant4.addDetectorConstruction('Geant4DetectorGeometryConstruction/ConstructGeo')
     ....
     # Enable GFlash shower model
     model = DDG4.DetectorConstruction(kernel, str('Geant4GFlashShowerModel/ShowerModel'))
     model.Parametrization = 'GFlashHomoShowerParameterisation'
     # Mandatory model parameters
     model.RegionName = 'SiRegion'
     model.Material = 'Silicon'
     model.Enable = True
     # Energy boundaries are optional
     model.Emin  = {'e+': 0.1*GeV, 'e-': 0.1*GeV }  # Units in GeV
     model.Ekill = {'e+': 0.1*MeV, 'e-': 0.1*MeV }
     model.enableUI()
     seq.adopt(model)
     ```
     and the physics list.
     ```
     # Now build the physics list:
     phys = geant4.setupPhysics('FTFP_BERT')
     ph = DDG4.PhysicsList(kernel, str('Geant4FastPhysics/FastPhysicsList'))
     ph.EnabledParticles = ['e+', 'e-']
     ph.BeVerbose = True
     ph.enableUI()
     phys.adopt(ph)
     ```
   The setup of the regions is crucial for GFlash to work, because it applies to regions.
   For concrete detector constructors the proper regional setting are mandatory, but do not affect
   this implementation.
 
 * 2022-07-12 Andre Sailer ([PR#928](https://github.com/aidasoft/DD4hep/pull/928))
   - CI: Due to incompatibilities we can no longer test macOS on github
 
 * 2022-07-12 Markus Frank ([PR#927](https://github.com/aidasoft/DD4hep/pull/927))
   Easy possibility to store condition payloads as std::any.
   - Use of specialized handle class `dd4hep::ConditionAny` to support the functionality.
     The payload is automatically bound to an object of type std::any.
     Example code of constructor and how to access data:
      ```
     /// Emplacement construction
     std::vector<int> value;
     ... // fill data
     ConditionAny c2("name", "type", std::move(value));
   
     /// Construct conditions object with empty std::any  
     ConditionAny c2("name", "type");
     /// Assign data (empty vector<int>) to the payload:
     c2.get() = vector<int>();
   
     /// Access data:
     vector<int>& data = c2.as<vector<int> >();
        ```
      as a corollary to this approach these conditions can only be stored and retrieved from ROOT storage 
      if the requirement for ROOT are satisfied. Otherwise no other restrictions are imposed. 
      The corresponding grammar instance is part of the library.
   
   - Add example to illustrate the functionality in example/conditions:
      o   examples/Conditions/src/ConditionAnyExampleObjects.cpp
      o   examples/Conditions/src/ConditionAnyExampleObjects.h
      o   plugin: examples/Conditions/src/ConditionAnyExample_populate.cpp
          Invocation:
   ```
      $> geoPluginRun  -destroy -plugin DD4hep_ConditionAnyExample_populate \
           -input ../../DD4hep/examples/AlignDet/compact/Telescope.xml -iovs 1
      ```
   
   - Plugin example to test basic functionality and verify proper assignment works
      o   examples/Conditions/src/Conditions_any_basic.cpp
          Invocation:
   ```
   $> geoPluginRun -destroy -volmgr -plugin DD4hep_Conditions_any_basic
   
   ```
   - Add 2 tests illustrating this functionality.
 
 * 2022-07-09 Markus Frank ([PR#925](https://github.com/aidasoft/DD4hep/pull/925))
   Easy possibility to store condition payloads as std::any.
   - Use of specialized handle class `dd4hep::ConditionAny` to support the functionality.
     The payload is automatically bound to an object of type std::any.
     Example code of constructor and how to access data:
      ```
     /// Emplacement construction
     std::vector<int> value;
     ... // fill data
     ConditionAny c2("name", "type", std::move(value));
   
     /// Construct conditions object with empty std::any  
     ConditionAny c2("name", "type");
     /// Assign data (empty vector<int>) to the payload:
     c2.get() = vector<int>();
   
     /// Access data:
     vector<int>& data = c2.as<vector<int> >();
        ```
      as a corollary to this approach these conditions can only be stored and retrieved from ROOT storage 
      if the requirement for ROOT are satisfied. Otherwise no other restrictions are imposed. 
      The corresponding grammar instance is part of the library.
   
   - Add example to illustrate the functionality in example/conditions:
      o   examples/Conditions/src/ConditionAnyExampleObjects.cpp
      o   examples/Conditions/src/ConditionAnyExampleObjects.h
      o   plugin: examples/Conditions/src/ConditionAnyExample_populate.cpp
          Invocation:
   ```
      $> geoPluginRun  -destroy -plugin DD4hep_ConditionAnyExample_populate \
           -input ../../DD4hep/examples/AlignDet/compact/Telescope.xml -iovs 1
      ```
   
   - Plugin example to test basic functionality and verify proper assignment works
      o   examples/Conditions/src/Conditions_any_basic.cpp
          Invocation:
   ```
   $> geoPluginRun -destroy -volmgr -plugin DD4hep_Conditions_any_basic
   
   ```
 
 * 2022-07-07 Andre Sailer ([PR#922](https://github.com/aidasoft/DD4hep/pull/922))
   - LCIOOutput: Fix exception when trying to use a readout for different sub-detectors
   - EDM4hepOutput: Fix memory leak when re-using readouts for different sub-detectors
 
 * 2022-06-16 Markus Frank ([PR#917](https://github.com/aidasoft/DD4hep/pull/917))
   -- Improve error reporting if derived condition dependencies cannot be resolved 
   -- Add illustrating example
 
 * 2022-06-14 Paul Gessinger ([PR#911](https://github.com/aidasoft/DD4hep/pull/911))
   - Add `VariantParameters` extension + plugin to assign parameters to it by name.
 
 * 2022-06-08 Andre Sailer ([PR#914](https://github.com/aidasoft/DD4hep/pull/914))
   - DDSim: add possibility to use individual compact files, e.g.:
       ddsim --compactFile $DD4hep/examples/CLICSiD/compact/SiD_multiple_inputs.xml $DD4hep/examples/CLICSiD/compact/SiD_detectors_1.xml  $DD4hep/examples/CLICSiD/compact/SiD_detectors_2.xml $DD4hep/examples/CLICSiD/compact/SiD_close.xml --runType shell
 
 * 2022-05-18 Andre Sailer ([PR#912](https://github.com/aidasoft/DD4hep/pull/912))
   - Detector: some corrections to the function docstrings
 
 * 2022-05-09 Marco Clemencic ([PR#910](https://github.com/aidasoft/DD4hep/pull/910))
   - Plugin Service: check that the `LD_LIBRARY_PATH` (or `PATH` or `DYLD_LIBRAY_PATH`) are actually set before trying to use them (to avoid a crash)
 
 * 2022-04-29 Andre Sailer ([PR#908](https://github.com/aidasoft/DD4hep/pull/908))
   -  CMake: add a message about how to avoid errors when manuals cannot be build, fixes #907
 
 * 2022-04-28 Juraj Smiesko ([PR#906](https://github.com/aidasoft/DD4hep/pull/906))
   - bootstrap script runs all tests
 
 * 2022-04-28 Andre Sailer ([PR#905](https://github.com/aidasoft/DD4hep/pull/905))
   - SegmentationInterna: fix shadow warning for `s`
   - DDEve: fix shadow warnings for menuBar (bar), s
 
 # v01-20-02
 
 * 2022-04-04 Sanghyun Ko ([PR#902](https://github.com/aidasoft/dd4hep/pull/902))
   - Fix a bug that cannot set G4 const property, following up #884
 
 * 2022-03-30 Valentin Volkl ([PR#899](https://github.com/aidasoft/dd4hep/pull/899))
   - cmake: DD4hepConfig: Drop unnecessary call to DD4HEP_SETUP_BOOST_TARGETS
 
 * 2022-03-30 Markus Frank ([PR#898](https://github.com/aidasoft/dd4hep/pull/898))
   - Reduce coverity warnings
 
 * 2022-03-21 Markus Frank ([PR#897](https://github.com/aidasoft/dd4hep/pull/897))
   See for the example
   -- /examples/ClientTests/src/MaterialTester_geo.cpp
   -- /examples/OpticalSurfaces/compact/ReadMaterialProperties.xml
   -- /examples/OpticalSurfaces/scripts/ReadMaterialProperties.py
   
   The python file is only there to show that the G4 simulation does not get screwed.....
   Otherwise: to define properties, which do not participate in Geant4:
   ```
       <material name="Water">
         <D type="density" value="1.0" unit="g/cm3"/>
         <composite n="2" ref="H"/>
         <composite n="1" ref="O"/>
         <!-- Properties used by Geant4    -->
         <property name="RINDEX"        ref="RINDEX__0x123aff00"/>
         <property name="ABSLENGTH"     ref="ABSLENGTH__0x123aff00"/>
         <property name="FASTCOMPONENT" ref="FASTCOMPONENT__0x123aff00"/>
         <property name="SLOWCOMPONENT" ref="SLOWCOMPONENT__0x123aff00"/>
         <!-- Properties ignored by Geant4 -->
         <property name="Property_of_mine" ref="Water__0x123aff00"/>
         <constant name="BirksConstant"    ref="Birk__Water|Geant4-ignore"/>
         <!-- Constants  ignored by Geant4 -->
         <constant name="Constant_of_mine" ref="Water__Mine|Geant4-ignore"/>
       </material>
   ```
   where:
   ```
     <properties>
       <constant name="Birk__Water|Geant4-ignore" value="12.345678"/>
       <constant name="Water__Mine|Geant4-ignore" value="87.654321"/>
     </properties>
   ```
   and
   ```
       <matrix name= "Water__0x123aff00" option="Geant4-ignore" coldim="1" values="  
                 2.034*eV 
                 2.068*eV 
                 2.103*eV 
                 2.139*eV 
                 2.177*eV 
                 2.216*eV 
       "/>
     </properties>
   ```
   For non-const properties you have to set the option to "Geant4-ignore",
   otherwise you append the string to the name. The "ref" string in the material
   and the property must match.
   In the program you can then access the propertiers by name like this:
   ```
   Material material(...)
   double v = material->GetConstProperty("BirksConstant");
   TGDMLMatrix* m = material->GetProperty("Property_of_mine");
   ```
   like any other property. See for details:
   /examples/ClientTests/src/MaterialTester_geo.cpp lines 78-108
 
 * 2022-03-21 Wouter Deconinck ([PR#896](https://github.com/aidasoft/dd4hep/pull/896))
   - edm4hep: don't add particle as parent to its daughters, and vice versa
 
 * 2022-03-15 Paul Gessinger ([PR#895](https://github.com/aidasoft/dd4hep/pull/895))
   - Allow relaxing the python version requirements at CMake level via option `DD4HEP_RELAX_PYVER`.
 
 # v01-20-01
 
 * 2022-03-08 Markus FRANK ([PR#894](https://github.com/AIDASoft/DD4hep/pull/894))
   - The refactoring of namespaces (some years ago) left some factory name discrepancies in DDEve.
   This PR fixes them and re-enables the various views and projections.
   See issue https://github.com/AIDASoft/DD4hep/issues/893.
   - There are still some issues when loading a new file, which are not yet entirely understood.
   The suspicion is that the displayed 2D histograms somehow "reside" in the opened file and disappear
   when the file is closed. This however needs confirmation (and eventually fixing).
 
 * 2022-03-04 Wouter Deconinck ([PR#892](https://github.com/AIDASoft/DD4hep/pull/892))
   - Support `ddsim --gun.momentumMin 1*GeV --momentumMax 10*GeV` (default remains momentumMin = 0.0)
 
 * 2022-02-25 Andre Sailer ([PR#891](https://github.com/AIDASoft/DD4hep/pull/891))
   - DDParsers: do not use deprecated boost headers with boost 1.78
   - DDG4 Particle.tbl: drop some diffr(active) particles causing warnings with Geant4 11.0
   - DetectorIMP: Changing message about Geant4 unit system to INFO, fixes #844
   - Volumes: Changing message about REFLECTION to DEBUG, fixes #844
 
 # v01-20
 
 * 2021-12-21 Markus Frank ([PR#888](https://github.com/aidasoft/DD4hep/pull/888))
   - Changes for Geant4 11.0.0.
     Propagate additional setup properties for optical parameters in Geant4ScintillationPhysics.
     Other required changes were already included when preparing for the Geant4 beta release.
   - Allow for Geant4 builds without GDML.
     Enable conditional build if the Geant4 build does not support GDML
 
 * 2021-12-16 Thomas Madlener ([PR#887](https://github.com/aidasoft/DD4hep/pull/887))
   - Rework the EDM4hep output action. The major reason is the renaming of the default types in AIDASoft/podio#205 and its effects on EDM4hep (key4hep/EDM4hep#132). These changes are:
     - Use `auto` wherever possible to remove any explicit mentioning of EDM4hep types.
     - Switch to range-based for-loops where possible
     - Keep an internal map of the collections to get rid of the `const_cast`s that were used before.
   - EDM4hep output: Make sure that the daughter relations are also set, because that is not done automatically in EDM4hep but is in LCIO.
 
 * 2021-12-02 Wouter Deconinck ([PR#886](https://github.com/aidasoft/DD4hep/pull/886))
   - Add diquarks to default DDG4 rejectPDGs list
 
 * 2021-11-26 Markus Frank ([PR#885](https://github.com/aidasoft/DD4hep/pull/885))
   - Remove another occurrency of a call to G4::GetPropertyIndex() with 2nd argument.
   - This PR is an addendum to the already closed request https://github.com/AIDASoft/DD4hep/pull/884
 
 * 2021-11-22 Markus Frank ([PR#884](https://github.com/aidasoft/DD4hep/pull/884))
   - Issue https://github.com/AIDASoft/DD4hep/issues/881
     Next attempt for resolution. Avoid explicit use of the second argument in 
   ```
     G4int GetConstPropertyIndex(const G4String& key,
                                 G4bool warning = false) const;
     // Get the constant property index from the key-name
   
     G4int GetPropertyIndex(const G4String& key, G4bool warning = false) const;
     // Get the property index by the key-name.
     ```
     Should satisfy existing and future snapshots of Geant4.
 
 # v01-19
 
 * 2021-11-12 Markus Frank ([PR#882](https://github.com/aidasoft/DD4hep/pull/882))
   - See issue in github: https://github.com/AIDASoft/DD4hep/issues/881
   - Material properties have changed in Geant4 between version 10 and 11.
   - This fix should fix the compilation problems and take new properties in Geant4.11 into account.
 
 * 2021-11-12 MarkusFrankATcernch ([PR#876](https://github.com/aidasoft/DD4hep/pull/876))
   - Fix cmake issue when using cmake 3.16.3 (or any of the other versions of cmake that require special python version handling presumably) in a dependent package.
 
 * 2021-11-10 Ben Couturier ([PR#880](https://github.com/aidasoft/DD4hep/pull/880))
   - Added the default move constructor and default move assignment operator to dd4hep::detail::ConditionObject and dd4hep::NamedObject
 
 * 2021-11-03 Markus Frank ([PR#877](https://github.com/aidasoft/DD4hep/pull/877))
   - To not compromize client code with an enforced termination handler, the DD4hep termination handler
   moved to DDG4, where it actually is needed. In DDG4 the termination handler is activated when the main
   Geant4Kernel instance is created.
   Reasoning: Please see issue https://github.com/AIDASoft/DD4hep/issues/874 .
   - Throw an exception if clients ask a DetElement handle for a child by name if such a child is not present or the handle is invalid. This is the new default now. The old behaviour is kept with a second accessor for children by name, with an explicit statement that an exception is unwanted such as: child = DetElement::child("name", false)
   Please see issue: https://github.com/AIDASoft/DD4hep/issues/878.
 
 * 2021-10-13 Markus Frank ([PR#873](https://github.com/aidasoft/DD4hep/pull/873))
   - Remove internal classes from evaluator. Use STL provided classes 
   - Remove hidden clashes with CLHEP evaluator (move internal class Item to anonymous namespace)
 
 * 2021-09-22 Wouter Deconinck ([PR#872](https://github.com/aidasoft/DD4hep/pull/872))
   - Allow for specifying MomentumMin and MomentumMax in Geant4IsotropeGenerator
 
 * 2021-09-15 Markus Frank ([PR#871](https://github.com/aidasoft/DD4hep/pull/871))
   - Finalize CAD stuff.
   - Fix issue https://github.com/AIDASoft/DD4hep/issues/870
 
 # v01-18
 
 * 2021-09-07 Wouter Deconinck ([PR#869](https://github.com/aidasoft/DD4hep/pull/869))
   - Use G4OpticalParameters in geant4.10.7 and newer
 
 * 2021-09-06 Andre Sailer ([PR#863](https://github.com/aidasoft/DD4hep/pull/863))
   - DDSim: add possibility for users to inject configurations for their own output plugins. See example in OutputConfig section of the steering file
 
 * 2021-08-31 Markus Frank ([PR#867](https://github.com/aidasoft/DD4hep/pull/867))
   - Mainly update reference files for CAD shape tests, since the order of the vertices changed when adding facets
     with vertex indices rather than coordinates.
 
 * 2021-08-30 Markus Frank ([PR#866](https://github.com/aidasoft/DD4hep/pull/866))
   - The export of beoolean shapes (union, subtraction, intersection) to was not properly working
     and actually casued segment vialotions. This PR fixes the problem and handles these shapes
     properly using the RootCsg operations for boolean shapes.
   - Examples geometries were provided by Gerri from FCC:  examples/ClientTests/compact/FCCmachine and files thereein.
   - Test example is in DDCAD:   DDCAD_export_FCC_machine and DDCAD_import_FCC_machine
   - This PR addresses the issues: https://github.com/AIDASoft/DD4hep/issues/813 , https://github.com/AIDASoft/DD4hep/issues/858
 
 * 2021-08-25 Markus Frank ([PR#865](https://github.com/aidasoft/DD4hep/pull/865))
   - In cmake tests use the macro ${Python_EXECUTABLE} to invoke the python interpreter rather than
     only `python`.
   - if  `FIND_PACKAGE(Python ${REQUIRE_PYTHON_VERSION} EXACT QUIET COMPONENTS Interpreter)`
     does not resolve the python executable fall back to `python${Python_VERSION_MAJOR}`.
 
 * 2021-08-24 Markus FRANK ([PR#864](https://github.com/aidasoft/DD4hep/pull/864))
   - Support for multiple readouts or (G4VUserParallelWorld equivalent)
     Issue https://github.com/AIDASoft/DD4hep/issues/861
     Example: 
     examples/CLICSiD/compact/SiD_ECAL_Parallel_Readout.xml + 
     examples/CLICSiD/scripts/SiD_ECAL_Parallel_Readout.py
   
     For a given subdetector the sequence of sensitive actions can be enhanced
     having multiple sensitive actions where each one can have its own Readout
     definition. Hence each action can produce its own set of hits depending on the
     readout geometry (segmentation).
     in XML these readout structures must first be defined:
   ```
     <readouts>
       <readout name="EcalBarrelHits">
         <segmentation type="CartesianGridXY" grid_size_x="3.5" grid_size_y="3.5" />
         <id>system:8,barrel:3,module:4,layer:6,slice:5,x:32:-16,y:-16</id>
       </readout>        
   
       <readout name="EcalBarrelHits_0">
         <segmentation type="CartesianGridXY" grid_size_x="1" grid_size_y="1" />
         <id>system:8,barrel:3,module:4,layer:6,slice:5,x:32:-16,y:-16</id>
       </readout>        
    ....
     </readouts>
   
   ```
   and can then be assigned to the sensitive actions in the python setup:
   ```  det = str('EcalBarrel')
     typ = sid.geant4.sensitive_types['calorimeter']
     seq = DDG4.SensitiveSequence(sid.kernel, str('Geant4SensDetActionSequence/') + det)
     seq.enableUI()
     act = DDG4.SensitiveAction(sid.kernel, str(typ + '/EcalBarrelHandler'), det)
     act.enableUI()
     seq.add(act)
     # Add extra parallel readout action with readout EcalBarrelHits_0
     act = DDG4.SensitiveAction(sid.kernel, str(typ + '/EcalBarrelHandler_0'), det)
     act.ReadoutName = 'EcalBarrelHits_0'
     act.enableUI()
     seq.add(act)
     # Add extra parallel readout action with readout EcalBarrelHits_1
     act = DDG4.SensitiveAction(sid.kernel, str(typ + '/EcalBarrelHandler_1'), det)
     act.ReadoutName = 'EcalBarrelHits_1'
   ...
   ```
 
 * 2021-08-10 Wouter Deconinck ([PR#860](https://github.com/aidasoft/DD4hep/pull/860))
   - Optionally import gdml physvol below top level, avoiding world
 
 * 2021-08-03 Valentin Volkl ([PR#855](https://github.com/aidasoft/DD4hep/pull/855))
   - [testing] separate import test for ddg4 and rest of dd4hep
 
 * 2021-07-29 Markus FRANK ([PR#853](https://github.com/aidasoft/DD4hep/pull/853))
   - Implement fix as proposed in issue https://github.com/AIDASoft/DD4hep/issues/850.
 
 * 2021-07-27 Whitney Armstrong ([PR#851](https://github.com/aidasoft/DD4hep/pull/851))
   - Using `ref="OtherVisName"` attribute with the `vis` tag, the visualization attribute is an extension of
   `"OtherVisName"` which is used to initialize the new vis attribute.
    - The new VisAttr inherits all the properties  of the ref and additional arguments override these values.
   
   Example where the only difference is the `alpha` value.
   
   ```
     <vis name="SiVertexBarrelModuleVis"
          alpha="1.0" r="1.0" g="0.75" b="0.76"
          drawingStyle="wireframe"
          showDaughters="false"
          visible="true"/>
   
     <vis name="SiVertexEndcapModuleVis"
          ref="SiVertexBarrelModuleVis"
          alpha="0.5"/>
   ```
 
 * 2021-07-22 Whitney Armstrong ([PR#849](https://github.com/aidasoft/DD4hep/pull/849))
   - Fix G4Sphere construction to use delta theta/phi instead of TGeo's ending angles phi2/theta2.
 
 * 2021-07-21 Placido Fernandez Declara ([PR#847](https://github.com/aidasoft/DD4hep/pull/847))
   - EDM4hepOutput: On collection creation for EDM4hep, save CellIDEncodingString
 
 * 2021-06-24 Thomas Madlener ([PR#843](https://github.com/aidasoft/DD4hep/pull/843))
   - Explicitly enable `C` as language to avoid problems in the build file generation step of cmake (see spack/spack#24232)
 
 # v01-17-00
 
 * 2021-06-02 Andre Sailer ([PR#838](https://github.com/aidasoft/DD4hep/pull/838))
   - Geant4ShapeConverter: ExtrudedSolid: convert all vertices, fix #836, https://github.com/cms-sw/cmssw/issues/33656
 
 * 2021-06-01 Marko Petric ([PR#840](https://github.com/aidasoft/DD4hep/pull/840))
   - Do not propagate CMAKE_BUILD_TYPE in DD4hepConfig.cmake
 
 * 2021-05-27 Markus FRANK ([PR#835](https://github.com/aidasoft/DD4hep/pull/835))
   - On divisions the created solids did not carry the proper tag to identify them.
     This PR fixes this issue when multi-volumes are imported in dd4hep.
     See issue https://github.com/AIDASoft/DD4hep/issues/833
 
 * 2021-05-17 Markus FRANK ([PR#829](https://github.com/aidasoft/DD4hep/pull/829))
   - Add missing Solid instantiation for TGeoCtub
 
 * 2021-05-12 Andre Sailer ([PR#823](https://github.com/aidasoft/DD4hep/pull/823))
   - DDSim: add possibility for users to extend the physics setup with Physics.setupUserFunction
 
 * 2021-05-07 Markus FRANK ([PR#825](https://github.com/aidasoft/DD4hep/pull/825))
   - Fix as reported from CMS
 
 * 2021-05-01 Markus FRANK ([PR#821](https://github.com/aidasoft/DD4hep/pull/821))
   - Fix issue #820
 
 * 2021-04-27 Andre Sailer ([PR#817](https://github.com/aidasoft/DD4hep/pull/817))
   - Move `create_segmentation` to DDCore/include/DD4hep/detail/SegmentationsInterna.h  to allow segmentation creation in other libraries
   - Removed REGISTER_SEGMENTATION macro and DDSegmentation::SegmentationFactory class because they are obsolete. Use DECLARE_SEGMENTATION to create a plugin entry for segmentations.
 
 * 2021-04-24 Markus FRANK ([PR#816](https://github.com/aidasoft/DD4hep/pull/816))
   - Following requests, the support to output Volumes as CAD meshes.
     Depending on the underlying technology material names and visual attributes are supported
   - Improve CAD imports to take into account material names and visual attributes if supported
     by the underlying CAD format.
   - Add two examples showing the import and export technique.
 
 * 2021-04-15 Markus FRANK ([PR#809](https://github.com/aidasoft/DD4hep/pull/809))
   - DDG4: Extend existing sensitive detectors to be used for GFlash parametrized fast simulations
   - DDG4: Remove legacy sensitive detectors, since they are no longer used by FCC
 
 * 2021-04-15 Markus FRANK ([PR#808](https://github.com/aidasoft/DD4hep/pull/808))
   - Disable copy and move construction/assignment in Geant4 data
     See issue https://github.com/AIDASoft/DD4hep/issues/807
   - Adopt new naming convention for Geant4 assembly imprints
      See issue https://github.com/AIDASoft/DD4hep/issues/804
   - Add G4FastSimulationManagerProcess for GFlash
 
 * 2021-04-12 Marko Petric ([PR#803](https://github.com/aidasoft/DD4hep/pull/803))
   - Fix bug in evaluator reported by Coverity
 
 # v01-16-01
 
 * 2021-03-26 Andre Sailer ([PR#799](https://github.com/AIDASoft/DD4hep/pull/799))
   - DDG4: flush the geant4 strstream buffer after run. fixes #798
 
 * 2021-03-26 Marko Petric ([PR#793](https://github.com/AIDASoft/DD4hep/pull/793))
   - Account for possible units rounding bug in Tube creation (address #784 )
 
 * 2021-03-23 Andre Sailer ([PR#797](https://github.com/AIDASoft/DD4hep/pull/797))
   - DDG4Dict: Adapt to changes in Root 6.24
 
 * 2021-03-23 Andre Sailer ([PR#796](https://github.com/AIDASoft/DD4hep/pull/796))
   - RootDictionary: fix incompatibility with Root 6.24
 
 * 2021-03-23 Andre Sailer ([PR#795](https://github.com/AIDASoft/DD4hep/pull/795))
   - Geant4Input: Add debug output for accepting or rejecting Particles
 
 * 2021-03-14 Markus FRANK ([PR#794](https://github.com/AIDASoft/DD4hep/pull/794))
   - Address Coverity issues
 
 * 2021-03-12 Marko Petric ([PR#792](https://github.com/AIDASoft/DD4hep/pull/792))
   - Use `CMAKE_SHARED_LIBRARY_SUFFIX` to define suffix of assimp libs
   - Define `BUILD_BYPRODUCTS` for compatibility with `ninja`
 
 * 2021-03-12 Markus FRANK ([PR#791](https://github.com/AIDASoft/DD4hep/pull/791))
   - Remove a bunch of Coverity warnings.
 
 * 2021-03-12 MarkusFrankATcernch ([PR#790](https://github.com/AIDASoft/DD4hep/pull/790))
   - update materialBudget utility
       -  allow to optionally use pseudo rapidity eta rather than polar angle
 
 * 2021-03-12 Marko Petric ([PR#788](https://github.com/AIDASoft/DD4hep/pull/788))
   - Use flag `--as-needed` for GNU linkers
 
 * 2021-03-11 Markus FRANK ([PR#789](https://github.com/AIDASoft/DD4hep/pull/789))
   - Fix several coverity warnings
   - Fix bug in extracting unsigned int/long from xml: conversion to unsigned values had a bug.
   - Remove unnecessary printout in Geant4Converter
 
 # v01-16
 
 * 2021-03-02 Markus FRANK ([PR#787](https://github.com/AIDASoft/DD4hep/pull/787))
   - Resolves #786. Also add an example to reproduce the Fix.
   - Add protection in Detector object against registering DetElements without placement
   - Modernize loop handling according to C++ 17 standards
 
 * 2021-02-15 Andre Sailer ([PR#783](https://github.com/AIDASoft/DD4hep/pull/783))
   - Adapt to new ROOT mechanism for switching the unit system.
     Units can be switched now multiple times provided the units are unlocked in the TGeoManager.
     See TGeoManager::LockDefaultUnits(Bool_t new_value).
     This is only available for ROOT versions >= 6.22.08
   - Improve examples/Conditions. Allow for more complex dependencies. Not enabled by default.
 
 * 2021-01-31 Markus FRANK ([PR#779](https://github.com/AIDASoft/DD4hep/pull/779))
   - Propagate changes in ComponentCast to the EDM module
 
 * 2021-01-30 Markus FRANK ([PR#778](https://github.com/AIDASoft/DD4hep/pull/778))
   - Move the header DD4hep/detail/Grammar_parsed.h to DD4hep/GrammarParsed.h
   - Move the header DD4hep/detail/Grammar_unparsed.h to DD4hep/GrammarUnparsed.h
   - Try to improve type agnostic ABI cast. Works for down casts only.
 
 * 2021-01-08 Markus FRANK ([PR#772](https://github.com/AIDASoft/DD4hep/pull/772))
   - This is the first release prepared to use Geant4 units (mm,ns,MeV). This compilation mode can be steered by a cmake flag: `-DDD4HEP_USE_GEANT4_UNITS=ON`. Once set, the flag is automatically propagated to depending projects in the generated `DD4hepConfig.cmake`. It programs TGeo to use the Geant4 units system. The unit system is applied also to depending quantities like interaction lengths etc.
   - Update some tests and ensure compatibility in the checks/reference files for both unit system. There is one caveat: Mesh-creation of shapes depends to some degree on the unit system, because mesh points are  removed depending on a tolerance value which is the same for both systems.
   - A fix had to be applied to propagate the flag `DD4HEP_BUILD_DEBUG` to depending projects.  This flag affects some object layouts and hence MUST be applied also to depending projects.
   - Remove inclusions of `Plugins.h` from being processed by rootcling. Plugins.h uses `#include <any>`, which cannot be processed.
 
 * 2020-12-18 Marko Petric ([PR#771](https://github.com/AIDASoft/DD4hep/pull/771))
   - Expand list of cmake versions that have bug in detecting python version  (see AIDASoft/podio#162)
 
 # v01-15
 
 * 2020-12-08 Frank Gaede ([PR#740](https://github.com/AIDASoft/DD4hep/pull/740))
   - add back the  Geant4Output2EDM4hep plugin from EDM4hep
        - use optional flag `D4HEP_USE_EDM4HEP` to build this
        - requires podio and EDM4hep to be present
   - fix treatment of units in Geant4Output2EDM4hep
   - DDTest: add optional ddsim tests with edm4hep and lcio output (A.Sailer)
   - enable `D4HEP_USE_EDM4HEP` in CI for dev (A.Sailer)
 
 * 2020-12-07 Christopher Jones ([PR#767](https://github.com/AIDASoft/DD4hep/pull/767))
   - Made internal classes used by Evaluator to be less stateful
   - Switch to using a read/write lock as modifications to the Evaluator are much less frequent than reads.
   - Added unit test for Evaluator
 
 * 2020-12-04 Andre Sailer ([PR#766](https://github.com/AIDASoft/DD4hep/pull/766))
   - DDG4: hepmc3reader: add checks for read and skip success
   - DDTest: test hepmc3 reader, make lcio and hepmc3 reader tests depend on configuration.
 
 * 2020-12-04 Andre Sailer ([PR#765](https://github.com/AIDASoft/DD4hep/pull/765))
   - DDG4: Geant4InputHandling: create particle with 4 vector (vecP, E), solves issue where the dynamic mass differs from the PDG mass (e.g., via particle.tbl / extraParticles), #760
 
 * 2020-12-03 MarkusFrankATcernch ([PR#753](https://github.com/AIDASoft/DD4hep/pull/753))
   - Always use `CLHEP/Units/SystemOfUnits.h` and never `G4SystemOfUnits.hh`
     -  in `G4SystemOfUnits.hh`units are directly in the top level namespace
     - in `CLHEP/Units/SystemOfUnits.h` units are in the `CLHEP::` namespace
   - Remove all usage `using namespace CLHEP` and `using CLHEP::__some_unit__` to clarify which unit is used
 
 * 2020-12-02 MarkusFrankATcernch ([PR#764](https://github.com/AIDASoft/DD4hep/pull/764))
   - Make scaled shapes includes conditional on Geant4 version (>=10.3)
   - Improve thread safety of expression evaluator
 
 * 2020-12-02 Andre Sailer ([PR#754](https://github.com/AIDASoft/DD4hep/pull/754))
   - ddsim: fix problem with `--dumpSteeringFile` in python3
   - ddsim: fix issue in where isotrop was False, when distribution was set (python3)
   - ddsim: fix exception in exceptions for gun direction and position
   - ddsim: fix problem where `hepmc.useHepMC3` was always True by default
   - PluginManager: rename the listcomponents executable to listcomponents_dd4hep, to avoid clash with the Gaudi listcomponents. This is transparent for users of the dd4hep_add_plugin cmake macro.
   - DDG4Dict: remove `dd4hep::sim::Geant4InputAction::Particles;` as this is available under a different name, fixes warning
   - CMake: DD4hepConfig.cmake: use find_dependency with CONFIG for Geant4, TBB, ROOT, LCIO, and if needed CLHEP, to avoid accidental use of `Find<PACKAGE>.cmake` modules
 
 * 2020-11-24 MarkusFrankATcernch ([PR#757](https://github.com/AIDASoft/DD4hep/pull/757))
   - Expression evaluation was not protected against race conditions when executing in multiple threads. We lock now the evaluation namespace with an associated lock when evaluating expression statements. Each evaluation call is wrapped and protected. This should ensure thread safety.
 
 * 2020-11-24 Marko Petric ([PR#751](https://github.com/AIDASoft/DD4hep/pull/751))
   - Resolve which type of linker is used and assign proper linking flags
 
 * 2020-11-21 Markus FRANK ([PR#756](https://github.com/AIDASoft/DD4hep/pull/756))
   - Remove from Geant4 conversion of scaled shapes artifacts of the prior implementation of reflections.
     This was a wrong implementation and should now be fixed.
     This PR should fix issue https://github.com/AIDASoft/DD4hep/issues/750
   - Introduce the Scale (based on TGeoScaledShape) as a separate shape om DD4hep.
   - Add test for scaled shape
 
 * 2020-11-19 Marko Petric ([PR#749](https://github.com/AIDASoft/DD4hep/pull/749))
   - Add explanation of the system of units to the user manual
 
 * 2020-11-19 MarkusFrankATcernch ([PR#748](https://github.com/AIDASoft/DD4hep/pull/748))
   - Review documentation
     o Add chapter to describe MC truth handling for DDG4
     o Review shape and shape plugin section in the DD4hep manual
   - Adapt ConeSegment shape plugin to allow for standard syntax
   - Fix Torus shape plugin and test 
   - Add copyright notice to various test files
 
 * 2020-11-19 Ole Hansen ([PR#745](https://github.com/AIDASoft/DD4hep/pull/745))
   - Improve path handling in setup scripts, by avoiding duplicates in paths. Also support whitespaces in paths and don't add system paths to library paths on macOS
 
 * 2020-11-19 Ole Hansen ([PR#743](https://github.com/AIDASoft/DD4hep/pull/743))
   - Fix compilation warnings from Apple Clang 12
   - Fix broken `t_CLICSiD_DDG4_g4geometry_scan_LONGTEST` test condition which always matched.
 
 * 2020-11-18 Ole Hansen ([PR#744](https://github.com/AIDASoft/DD4hep/pull/744))
   - CMake: Fix regression that examples and example tests can now be built and run together with the main project
 
 * 2020-11-16 Markus FRANK ([PR#747](https://github.com/AIDASoft/DD4hep/pull/747))
   - Add documentation of DDG4 Monte-Carlo truth handler
   - Add documentation of DDG4 ROOT output module
 
 * 2020-11-13 Markus FRANK ([PR#742](https://github.com/AIDASoft/DD4hep/pull/742))
   - Add example for CMS CSC: tests divisions
   - Add example for CMS ECAL: tests reflections
   - Improve DDG4_MySensDet: Example illustrating how to have customized sensitive detectors and user defined hit classes with data saved to ROOT. Example corresponding to question raised in https://github.com/AIDASoft/DD4hep/issues/703
   The example also includes a small script to read back the data generated with this example:
   Command line usage:
      *  $> root.exe
      *  ....
      *  root [0] gSystem->Load("libDDG4Plugins.so");
      *  root [1] gSystem->Load("libDDG4_MySensDet.so");
      *  root [2] SomeExperiment::Dump::dumpData(<num-ebents>,<file-name>);
   
   - Remove the odd shadowing warning.
   - Improve visualization attributes:
     As reported by Sanhyung Ko (https://indico.cern.ch/event/967418/contributions/4075358/attachments/2128099/3583278/201009_shKo_dd4hep.pdf) the application of visual attributes to volumes was very resource intensive. 
     This should be fixed by asking for the transparent color only once at the level of the attribute rather then for each volume.
 
 * 2020-11-11 Frank Gaede ([PR#738](https://github.com/AIDASoft/DD4hep/pull/738))
   - fix units in DDG4/LCIO conversions  
        - prepend namespace CLHEP where missing
 
 * 2020-11-10 Markus FRANK ([PR#736](https://github.com/AIDASoft/DD4hep/pull/736))
   - Update DDCMS example to take into account new xml tags.
   - Improve some core object helpers
 
 * 2020-11-06 Markus FRANK ([PR#734](https://github.com/AIDASoft/DD4hep/pull/734))
   - No new implementation for reflections. Still uses TGeo way with scaled shape.
     This implementation is not supposed to be used.
   - Added test to debug reflections
 
 * 2020-11-05 Ianna Osborne ([PR#732](https://github.com/AIDASoft/DD4hep/pull/732))
   - Examples.DDCMS: add CMS EcalEndcap description to test reflected volumes
 
 * 2020-11-03 Andre Sailer ([PR#731](https://github.com/AIDASoft/DD4hep/pull/731))
   - Tests: Always run AClick tests sequentially, fixes #730
 
 * 2020-11-03 Andre Sailer ([PR#728](https://github.com/AIDASoft/DD4hep/pull/728))
   * CMake: fix python version compatibility check between python and root used for python. Add exception for CMake 3.17.1
   * Tests: fix some test configuration to run all tests after `-D DD4HEP_BUILD_EXAMPLES=ON`
   * Tests: fix tests for root 6.22.04 and master
 
 * 2020-11-02 Andre Sailer ([PR#725](https://github.com/AIDASoft/DD4hep/pull/725))
   -  CMake: fail if ROOT and DD4hep python disagree
 
 * 2020-10-14 Ianna Osborne ([PR#723](https://github.com/AIDASoft/DD4hep/pull/723))
   - SpecParRegistry: remove need for TBB
     - TBB has a slight overhead compare to std containers
     - Using std containers allows to return references to the containers in the registry
   
   - Reverse the plan to process XML files in parallel
 
 # v01-14-01
 
 * 2020-10-02 Markus Frank ([PR#720](https://github.com/AIDASoft/DD4hep/pull/720))
   - Add the ability to access the `DetElement` in a derived condition. Access to it is enabled now for all
   compilations (Debug + Release).
   - When parsing compact, it is possible to inject plugins to create tables with tabulated properties in C++
   - When parsing compact, it is possible to inject plugins to assign property tables to materials.
 
 * 2020-09-28 Marko Petric ([PR#718](https://github.com/AIDASoft/DD4hep/pull/718))
   - Replace deprecated `PyOS_AfterFork` with `PyOS_AfterFork_Child` for python 3.7 and above
 
 # v01-14
 
 * 2020-09-26 Markus Frank ([PR#717](https://github.com/aidasoft/dd4hep/pull/717))
   - Propagate condition names for printouts. Names are enabled by default. The feature can be disabled
     to minimize conditions memory footprint. Comment `DD4HEP_CONDITIONS_HAVE_NAME` in `DD4hep/config.h`
   
   - If the debug flag `DD4HEP_CONDITIONS_DEBUG` is set (enabled by the compile definition `DD4HEP_DEBUG`, which in turn is enabled by the cmake flag `DD4HEP_BUILD_DEBUG`, which is turned on in debug builds automatically), then condition objects offer optional storage e.g. to store the object address or an xml-string etc.
   
   - Update and fix some tests, which were assuming names
 
 * 2020-09-25 Marko Petric ([PR#715](https://github.com/aidasoft/dd4hep/pull/715))
   - Rename `TruncatedTube` `zHalf` accessor with `dZ` resolves #714 
   - Add to `Trap` missing `dZ` accessor resolves #713
 
 * 2020-09-23 Andre Sailer ([PR#712](https://github.com/aidasoft/dd4hep/pull/712))
   - Cmake: add configuration option DD4HEP_BUILD_DEBUG, if ON or OFF enable or disable the DD4HEP_DEBUG definition
   if not set, enable if BuildType is Debug, fixes #708
 
 * 2020-09-23 bcouturi ([PR#709](https://github.com/aidasoft/dd4hep/pull/709))
   - Added geoWebDisplay command that uses jsroot to render the Geometry, requires ROOT7 ROOTEve
 
 * 2020-09-23 Andre Sailer ([PR#707](https://github.com/aidasoft/dd4hep/pull/707))
   - DDG4.HepEvtReader: fix reading of input particles, fixes #706 
   - DDG4.HepEvtReader: fix the units, expecting GeV, mm as units of input files.
   - DDG4.HepEvtReader: add abort if the file cannot be read, e.g., when the content doesn't match what is expected
 
 * 2020-09-22 Marko Petric ([PR#710](https://github.com/aidasoft/dd4hep/pull/710))
   -  Fix variable name`SIGNATURE` in `Plugins.h` and `Plugins.inl` that conflicts with `#define` from `utmpx.h` in macOS libc implementation. Resolves #700
   - Migrate CI from Travis-CI to GitHub Actions and include macOS and ubuntu18 tests
 
 * 2020-09-17 Marko Petric ([PR#704](https://github.com/aidasoft/dd4hep/pull/704))
   - Apply `clang-tidy` `llvm-header-guard` fixer
 
 * 2020-09-16 Andre Sailer ([PR#705](https://github.com/aidasoft/dd4hep/pull/705))
   - DDSim: add options to select which sensitive detectors are trackers and calorimeters, defaults unchanged
   - DDSim: tweak log output formatting, logging goes now to stdout instead of stderr
   - SiD example: remove `track_length_max` and `time_max` from silicon limits (fixes part of #703 )
 
 * 2020-09-07 Markus Frank ([PR#702](https://github.com/aidasoft/dd4hep/pull/702))
   - Add `starttheta`, `endtheta`, `endphi` xml accessors. 
   - Fix sphere shape creator and update shape example.
 
 * 2020-09-04 Markus Frank ([PR#697](https://github.com/aidasoft/dd4hep/pull/697))
   - Implement data member accessors for construction parameters in `Shapes.h`. As discussed in the thread cms-sw/cmssw#30931 it was felt that read-only access to the basic construction parameters of a shape would be highly useful.
 
 * 2020-09-03 Marko Petric ([PR#699](https://github.com/aidasoft/dd4hep/pull/699))
   - Set search order for python on macOS to search for system/framework python last (change in behavior of cmake 3.14->3.15)
 
 * 2020-07-31 Markus Frank ([PR#692](https://github.com/aidasoft/dd4hep/pull/692))
   - Protect XML file handling against non-existing files.
 
 * 2020-07-30 Markus Frank ([PR#691](https://github.com/aidasoft/dd4hep/pull/691))
   - Improve matrix helpers: Add extractors for scale and translation as `XYZVector` from `TGeoMatrix`.
   - Add example to simulate the MiniTel with DDG4 using a HepMC input file
   - Add example to load a sub-detector geometry from gdml.
 
 * 2020-07-27 Markus Frank ([PR#690](https://github.com/aidasoft/dd4hep/pull/690))
   1) New example to show the usage of multiple compact input files being processed from the command line.
       The example illustrates how to maniplulate the opening and the closing of the geometry using the compact notation.
       ```
        geoDisplay  -input file:SiD_multiple_inputs.xml \
                            -input file:SiD_detectors_1.xml \
                            -input file:SiD_detectors_2.xml \
                            -input file:SiD_close.xml \
                            -print INFO -destroy -volmgr -load```
   2) New example to scan the geometry starting from a given position in a certain direction. Command line like for g4MaterialScan.
       The output shows then the pathes to the volumes traversed, the shape and the material of these volumes.
   
       `g4GeometryScan --compact=DDDetectors/compact/SiD.xml --position=0,0,0 --direction=0,1,0`
   
      Resulting output:
      ```
       GeometryScan                      WARN  Starting tracking action for track ID=1
       +--------------------------------------------------------------------------------------------------------------------------------------------------
       | Material scan between: x_0 = (   0.00,   0.00,   0.00) [cm] and x_1 = (   0.00,3000.00,   0.00) [cm]  TrackID:1: 
       +--------------------------------------------------------------------------------------------------------------------------------------------------
       |     \                Path                                        
       | Num. \  Thickness    Length   Endpoint                   Volume , Shape , Material
       | Layer \   [cm]        [cm]    (     cm,     cm,     cm)         
       +--------------------------------------------------------------------------------------------------------------------------------------------------
       |     1      2.4500     2.450   (   0.00,   2.45,   0.00)  Path:"/world/BeamPipeVacuum_62" Shape:G4Polycone  Mat:Vacuum
       |     2      0.0500     2.500   (   0.00,   2.50,   0.00)  Path:"/world/Beampipe_53" Shape:G4Polycone  Mat:Beryllium
       |     3      0.1802     2.680   (   0.00,   2.68,   0.00)  Path:"/world/av_3_impr_1_layer1_pv_0" Shape:G4Tubs  Mat:Air
       |     4      0.0115     2.692   (   0.00,   2.69,   0.00)  Path:"/world/av_3_impr_1_layer1_pv_0/VtxBarrelModuleInner_4" Shape:G4Box  Mat:Air
       |     5      0.0130     2.705   (   0.00,   2.70,   0.00)  Path:"/world/av_3_impr_1_layer1_pv_0/VtxBarrelModuleInner_4/component0_0" Shape:G4Box  Mat:Carbon
       |     6      0.0256     2.730   (   0.00,   2.73,   0.00)  Path:"/world/av_3_impr_1_layer1_pv_0/VtxBarrelModuleInner_4" Shape:G4Box  Mat:Air
       |     7      0.0050     2.735   (   0.00,   2.74,   0.00)  Path:"/world/av_3_impr_1_layer1_pv_0/VtxBarrelModuleInner_4/component1_1" Shape:G4Box  Mat:Silicon
       |     8      0.0050     2.740   (   0.00,   2.74,   0.00)  Path:"/world/av_3_impr_1_layer1_pv_0/VtxBarrelModuleInner_4" Shape:G4Box  Mat:Air
       |     9      0.1596     2.900   (   0.00,   2.90,   0.00)  Path:"/world/av_3_impr_1_layer1_pv_0" Shape:G4Tubs  Mat:Air
       |    10      0.7000     3.600   (   0.00,   3.60,   0.00)  Path:"/world" Shape:G4Box  Mat:Air
       |    11      0.1844     3.784   (   0.00,   3.78,   0.00)  Path:"/world/av_3_impr_1_layer2_pv_1" Shape:G4Tubs  Mat:Air
       |    12      0.0115     3.796   (   0.00,   3.80,   0.00)  Path:"/world/av_3_impr_1_layer2_pv_1/VtxBarrelModuleOuter_4" Shape:G4Box  Mat:Air
       ....
      ```
 
 # v01-13-01
 
 * 2020-07-10 Markus Frank ([PR#686](https://github.com/AIDASoft/DD4hep/pull/686))
   - Fix bug in `VolumeBuilder` where `VolIDs` were not properly set to physical volumes if the `xml` supported an `id` tag.
 
 # v01-13
 
 * 2020-07-02 MarkusFrankATcernch ([PR#684](https://github.com/AIDASoft/DD4hep/pull/684))
   - Fix compiler issue for clang 3.9 (resolves #683)
 
 * 2020-07-02 Andre Sailer ([PR#682](https://github.com/AIDASoft/DD4hep/pull/682))
   - CMake: add option `DD4HEP_USE_TBB` to require TBB or not
   - `Filter` and `SpecParRegistry` classes from CMSSW (see #675)
 
 * 2020-07-01 vvolkl ([PR#679](https://github.com/AIDASoft/DD4hep/pull/679))
   - Add CPack Configuration
 
 * 2020-06-30 Markus Frank ([PR#680](https://github.com/AIDASoft/DD4hep/pull/680))
   - adopt IOV changes from @pikacic to work on macOS (see #678).
 
 * 2020-06-30 Marco Clemencic ([PR#678](https://github.com/AIDASoft/DD4hep/pull/678))
   - Modernization and clean up of `dd4hep::IOV` (`using` instead of `typedef`, `constexpr` instead of `enum`)
   - Make `dd4hep::IOV::Key` uniform wrt first and second type
   - Use `std::int64_t`instead of `long` for `dd4hep::IOV::Key` elements
 
 * 2020-06-18 lintao ([PR#677](https://github.com/AIDASoft/DD4hep/pull/677))
   - Fixed the `CLHEP::mm` to `dd4hep::mm` conversion problem in `DDG4/src/Geant4SensitiveDetector.cpp`
 
 * 2020-06-11 Markus FRANK ([PR#676](https://github.com/AIDASoft/DD4hep/pull/676))
   - Fix problem with missing header in DDEve appearing in ROOT head.
 
 * 2020-06-08 Marko Petric ([PR#673](https://github.com/AIDASoft/DD4hep/pull/673))
   - Use unique include guard in `BitFieldCoder.h`
     - fix ambiguity in test between `BitField64` in LCIO and DD4hep
   - Cast to string `coll_nam` in `DDG4.py` before using further, otherwise string concatenation does not work
 
 * 2020-05-29 Andre Sailer ([PR#672](https://github.com/AIDASoft/DD4hep/pull/672))
   - Use unique include guards
 
 * 2020-04-24 Frank Gaede ([PR#663](https://github.com/AIDASoft/DD4hep/pull/663))
   - fix compilation of `DigiKernel.cpp` with TBB
 
 * 2020-04-09 Andre Sailer ([PR#660](https://github.com/AIDASoft/DD4hep/pull/660))
   - DDG4: fix behaviour of ParticleRejectFilter and ParticleSelectFilter, They now properly select or reject the given particle type, instead of the opposite. Fixes #657
 
 * 2020-04-09 Markus FRANK ([PR#659](https://github.com/AIDASoft/DD4hep/pull/659))
   - Allow condition objects, which do not provide a default constructor. If such objects should be managed, these cannot be saved with ROOT - these objects may only live in memory. ROOT requires a default constructor.
 
 * 2020-04-09 Marko Petric ([PR#654](https://github.com/AIDASoft/DD4hep/pull/654))
   - Rewrite rpath usage on macOS and make it relocatable with help of `@rpath`
     - itroduce new option `DD4HEP_SET_RPATH` default `ON`
   - adopt `thisdd4hep.sh` and other `.sh` scripts to work with zsh (new default for macOS 10.15)
   - Drop `MakeGaudiMap.cmake` and call directly `listcomponents`
     - fix env settings for macOS
   - Drop deprecated `-std=` flag in dictionary creation
 
 * 2020-03-23 Andre Sailer ([PR#652](https://github.com/AIDASoft/DD4hep/pull/652))
   - Documentation: fix broken mathml, fixes #651
 
 * 2020-03-20 Andre Sailer ([PR#649](https://github.com/AIDASoft/DD4hep/pull/649))
   - CMake: add `DD4HEP_HIGH_MEM_POOL_DEPTH` option. Allow setting of parallel builds of DDParser objects with the ninja generator. Defaults to "memory / 2000 cores (rounded down)"
 
 * 2020-03-20 Andre Sailer ([PR#632](https://github.com/AIDASoft/DD4hep/pull/632))
   - CMake:  Adapt to ROOT 6.22 python library ROOTTPython
 
 * 2020-03-18 Andre Sailer ([PR#636](https://github.com/AIDASoft/DD4hep/pull/636))
   - DDG4: add reader for HepMC3 files
   - DDG4: add generic EventParameters class to pass event level parameters from different input sources to different output sources, supercedes the LCIOEventParameters class
 
 * 2020-03-11 Markus Frank ([PR#647](https://github.com/AIDASoft/DD4hep/pull/647))
   - The CAD volume plugin allows to embed valumes and shapes originating from Computer Aided Design drawings using multiple formats as they are supported by the open asset importer library (http://assimp.org ). The plugin can be used whenever the `xml` fragment matches the following pattern:
       ```xml
       <XXX ref="file-name"  material="material-name">   
         <material name="material-name"/>  <!-- alternative: child or attr -->
    
         Envelope:  Use special envelop shape (default: assembly)
                    The envelope tag must match the expected pattern of the utility
                    dd4hep::xml::createStdVolume(Detector& desc, xml::Element e)
         <envelope name="volume-name" material="material-name">
           <shape name="shape-name" type="shape-type" args....>
           </shape>
         </envelope>
    
         Option 1:  No additional children. use default material 
                    and place all children in the origin of the envelope
    
         Option 2:  Volume with default material
         <volume name="vol-name"/>
    
         Option 3:  Volume with non-default material
         <volume name="vol-name" material="material-name"/>
    
         Option 4:  Volume with optional placement. No position = (0,0,0), No rotation = (0,0,0)
         <volume name="vol-name" material="material-name"/>
           <position x="0" y="0" z="5*cm"/>
           <rotation x="0" y="0" z="0.5*pi*rad"/>
         </volume>
    
         For sensitive volumes: add physical volume IDs:
         <volume name="vol-name" material="material-name"/>
           <physvolid name="layer" value="1"/>
           <physvolid name="slice" value="10"/>
         </volume>
        </XXX>
        ```
 
 # v01-12-01
 
 * 2020-03-03 Marko Petric ([PR#641](https://github.com/AIDASoft/DD4hep/pull/641))
   - DDSim: make the output of `ddsim --dumpSteeringFile` visible again
   - DDSim: fix exception in ConfigHelper.printOptions, called by `--dumpParameters` option
   - DDSim: fix parsing of vector command line parameters, gun.position, gun.direction etc.
   - DDSim: better testing of command line parameters
 
 * 2020-03-03 vvolkl ([PR#640](https://github.com/AIDASoft/DD4hep/pull/640))
   - DDSim: add option to use edm4hep output
 
 # v01-12
 
 * 2020-02-26 Andre Sailer ([PR#637](https://github.com/aidasoft/dd4hep/pull/637))
   - LcioEventReader: fix setting of color flow, second coordinate was never set
 
 * 2020-02-25 Markus Frank ([PR#633](https://github.com/aidasoft/dd4hep/pull/633))
   - Added basic implementation for CAD interface to load shapes from CAD files. There is an open issue how to best embed the volume/shape loading from CAD files into the existing infrastructure. See for [presentation](https://indico.cern.ch/event/885083/contributions/3758180/attachments/1990793/3318984/2020-02-20-DD4hep-Tessellated-Shapes.pdf). This feature is only available if build against ROOT 6.22 or higher. 
   - DDCAD used the [assimp](https://github.com/assimp/assimp) librray to interprete the CAD files.
   - Simplify grammar instantiation. 
     - For grammars to be parsed with `boost::spirit` simply include
       `#include "DD4hep/detail/Grammar_parsed.h"`
     - For Grammars which should **not be parsed** with `boost::spirit` include
       `#include "DD4hep/detail/Grammar_unparsed.h"`
     - To instantiate the code and to register the instantiation call:
        `template <> dd4hep::Grammar<my-class>;`
     - If the Grammar is supposed to be registered call instead/in addition:
       `static auto s_registry = GrammarRegistry::pre_note<my-class>();`
      - All other macros are gone.
 
 * 2020-02-21 Andre Sailer ([PR#631](https://github.com/aidasoft/dd4hep/pull/631))
   - Only build DDG4 Python dependent libraries and pcms if Python and PyROOT are found
 
 * 2020-02-21 Andre Sailer ([PR#627](https://github.com/aidasoft/dd4hep/pull/627))
   - MakeGaudiMap: better inference of listcomponents and library location by using target properties
   - MakeGauiMap: Detailed information about the command is not only printed when VERBOSE=1
 
 * 2020-02-19 Marko Petric ([PR#626](https://github.com/aidasoft/dd4hep/pull/626))
   - Check in python modules that load `libglapi` is only called if the library is not already loaded.
 
 * 2020-02-19 Sebastien Ponce ([PR#624](https://github.com/aidasoft/dd4hep/pull/624))
   - Fixed bug in the `dd4hep_add_test_reg` function which was only taking into account the last dependency of a test when several were present.
 
 * 2020-02-19 Marko Petric ([PR#622](https://github.com/aidasoft/dd4hep/pull/622))
   - Add missing conversion from `unicode` to `str` for python 2 case in `DDrec.py`
   - Add test to check dd4hep python module imports
   - Fixes for tests from examples:
      - typo in tessellated example
      - make gdml read test dependent on the gdml write test
   - Add check to test if the version of python used to build ROOT is the same to the version detected by CMake to build DD4hep (works only from ROOT 6.20)
 
 * 2020-02-17 Andre Sailer ([PR#621](https://github.com/aidasoft/dd4hep/pull/621))
   - Cmake: dd4hep_add_dictionary: directly use command, no longer created bash script to be called. See details of call with `make VERBOSE=1`
   - PluginServiceV2: use `boost::split` instead of walking of char arrays, fix bug when two colons are in the environment variable. Fixes #600
 
 * 2020-02-13 Sebastien Ponce ([PR#620](https://github.com/aidasoft/dd4hep/pull/620))
   - added missing dependency of Persist_CLICSiD_Geant4 test on Persist_CLICSiD_Save_LONGTEST
 
 * 2020-02-11 Marko Petric ([PR#618](https://github.com/aidasoft/dd4hep/pull/618))
   - Fix from which version of ROOT `TGeoTessellated` is supported (starting only in 6.22)
   - Fix location of test file in tessellated example
 
 * 2020-02-06 Hadrien Grasland ([PR#613](https://github.com/aidasoft/dd4hep/pull/613))
   - Use the official CMake configuration mechanism provided by TBB >= 2017 U7.
   - Do not delete move constructors in DigiKernel as this breaks current versions of TBB.
 
 * 2020-02-05 Markus Frank ([PR#610](https://github.com/aidasoft/dd4hep/pull/610))
   - Thanks to @agheata, ROOT now supports tessellated shapes. These new shapes are now supported by DD4hep including the automatic translation to Geant4. The tessellated shapes feature is only supported when compiling against ROOT 6.20.0 or higher.
   - Added a basic shape test for the tessellated shape.
 
 * 2020-02-03 Markus Frank ([PR#608](https://github.com/aidasoft/dd4hep/pull/608))
   - SInce we do not use DTD checking all DTD links from lcdd xml files have been removed in examples. 
   - Add 2 examples to check the usage of NTP and STP temperature/pressure conditions
 
 * 2020-01-09 Markus Frank ([PR#606](https://github.com/aidasoft/dd4hep/pull/606))
   - Resolves #605 
   - There was an apparent bug when cloning `DetElement` trees. Not only for the top element, which should receive a new ID, this top ID was propagated to all children. This was clearly wrong. The correct solution is: 
       - Top element gets a new ID
       - Children keep their ID
   - If a user wants to preserve the old functionality the flag `DetElement::PROPAGATE_PARENT_ID` must be set in the clone statement.
 
 * 2019-12-18 Markus Frank ([PR#604](https://github.com/aidasoft/dd4hep/pull/604))
   - Allow to set ambient temperature and pressure for all materials. 
       - predefined settings: STP, NTP
       - Example:
          - `examples/ClientTests/compact/Check_Air.xml`
        - Apply global temperature and pressure for all materials and especially for one single material.
        - Verification for Geant4: `examples/ClientTests/scripts/Check_Air.py`
   - DDG4: allow Geant4 messengers to pass parameter string.
 
 * 2019-12-16 Markus Frank ([PR#603](https://github.com/aidasoft/dd4hep/pull/603))
   - Resolves #599
   - Resolves #601 
   - Work on #595
 
 * 2019-11-27 Markus Frank ([PR#597](https://github.com/aidasoft/dd4hep/pull/597))
   - Intermediate release to store improvements in the development of DDDigi:
     Start implementing noise chains
   - Fix cmake build if CLHEP is included in Geant4 and not external.
 
 * 2019-11-16 Markus Frank ([PR#596](https://github.com/aidasoft/dd4hep/pull/596))
   - Requre that all materials must be entered explicitly.
     - The default ROOT element table is disabled. 
   - Fix examples, which relied on the default ROOT elements being present
   - Fix #595 for DDCMS:
     - The density was not re-normalized to the units TGeo was expecting. Same for atomic weights.
     - Fill missing elements to `DDCMS/data/materials.xml` (Values to be cross-checked by CMS)
 
 * 2019-11-09 Markus Frank ([PR#593](https://github.com/aidasoft/dd4hep/pull/593))
   -  Fix Geant4 conversion for Polyhedra and Polycone if start_phi != 0 (See issue https://github.com/AIDASoft/DD4hep/issues/578)
   - Preparatory work to have placeholder volumes for twisted tubes (See issue https://github.com/AIDASoft/DD4hep/issues/588)
 
 * 2019-10-29 Andre Sailer ([PR#590](https://github.com/aidasoft/dd4hep/pull/590))
   - DumpBField: correct the column unit printout and prepare for eventual change of default length unit
   - MagneticFields example: correct the unit for the Z parameter of the MultiPole to tesla
 
 # v01-11-01
 * patch release for v01-11 that adds this PR to v01-11:
 * 2020-02-26 Andre Sailer (PR#637)
    - LcioEventReader: fix setting of color flow, second coordinate was never set
 
 # v01-11
 
 * 2019-10-23 MarkusFrankATcernch ([PR#587](https://github.com/AidaSoft/DD4hep/pull/587))
   -  Have separate compilation unit for shape utilities like `set_dimension(...)`, `dimension()`, `isA()`, `instanceOf()`... 
   - Improvements to basic shape test
 
 * 2019-10-23 Andre Sailer ([PR#579](https://github.com/AidaSoft/DD4hep/pull/579))
   - CMake: Add possibility to build only shared libraries, fixes #493: 
     - Usage `cmake ... -D BUILD_SHARED_LIBS=OFF ...`
 
 * 2019-10-23 Andre Sailer ([PR#575](https://github.com/AidaSoft/DD4hep/pull/575))
   * CMake: Add `DD4HEP_USE_EXISTING_DD4HEP` option which together with `DD4HEP_BUILD_PACKAGES` can be used to rebuild, for example only DDG4.
      * This creates a new Package called "DD4hepSelected" which can then be used alongside the full DD4hep Package in a third project.
 
 * 2019-10-22 Marko Petric ([PR#586](https://github.com/AidaSoft/DD4hep/pull/586))
   - Remove deprecated rootcling flags (`-cint`, `-c`, `-p`, `-std=c++`) from dictionary creation script
 
 * 2019-10-22 Marko Petric ([PR#585](https://github.com/AidaSoft/DD4hep/pull/585))
   - Fix bug that the c++ filesystem check is called from `${DD4hep_ROOT}`
   - Install `DD4hepConfig.cmake` only in `__prefix__/cmake` to avoid path detection confusion
   - Enable choosing examples in the `examples/CMakeLists.cmake` via cmake flag `-DDD4HEP_BUILD_EXAMPLES=OpticalSurfaces` (recommended method)
   - Make each example folder to compile standalone (not recommended method)
   - Update cmake of Segmentation example to more current state and fix resulting errors
     - include segmentation example as test
   - Resolves #582 and resolves #583
 
 * 2019-10-21 MarkusFrankATcernch ([PR#584](https://github.com/AidaSoft/DD4hep/pull/584))
   - Add function `bool isInstance(const Handle<TGeoShape>& solid)`
      - compares types of shapes and behaves like `dynamic_cast`, similar to python's `isinstance(obj,type)`
      - remove deprecated function `instanceOf` in favour of `isInstance`. Same behavior.
    - Add function `bool isA(const Handle<TGeoShape>& solid)`
      - compares types of shapes and requires exact match, no polymorphism allowed.
   - Add Geant4 conversion for shape `TGeoCtub` -> `G4CutTube`
 
 * 2019-10-14 Marko Petric ([PR#572](https://github.com/AidaSoft/DD4hep/pull/572))
   - Install python files in `lib/pythonX.Y/site-packages` resolves #562 
     - adapt `thisdd4hep.sh` scripts
   - Add missing RPATH to examples (basically bug fix for mac)
   - Add DDG4 tools to bin to make them more accessible to users:
     - `g4MaterialScan`, `checkGeometry`, `checkOverlaps`
 
 * 2019-10-03 MarkusFrankATcernch ([PR#577](https://github.com/AidaSoft/DD4hep/pull/577))
   - Inhibit not allowed use of `DetectorImp.h`
 
 * 2019-10-03 Andre Sailer ([PR#574](https://github.com/AidaSoft/DD4hep/pull/574))
   - CMake: When needing `boost::filesystem` (c++14, gcc  < 8) require at least Boost 1.56, see #567
 
 * 2019-10-03 Markus Frank ([PR#573](https://github.com/AidaSoft/DD4hep/pull/573))
   - Fix memory leak introduced when generalizing placements to include left-handed coordinate systems.
 
 * 2019-10-03 Markus Frank ([PR#571](https://github.com/AidaSoft/DD4hep/pull/571))
   - Add example to the volume reflection mechanism
   - Fix bug in volume reflection
 
 * 2019-10-02 Markus Frank ([PR#569](https://github.com/AidaSoft/DD4hep/pull/569))
   - First implementation to support reflection with left-handed volumes/solids
     - Changes for volumes and solids.
     - Conversion handling of `TGeoScaledShape` in DDG4
 
 * 2019-09-30 Andre Sailer ([PR#566](https://github.com/AidaSoft/DD4hep/pull/566))
   - PythonBindings: fix issue when source files were not available, fixes #565 
   - CMake: drop DDCores dependency on DD4hepGaudiPluginMgr
   - CMake: DD4hepConfig: use find_dependency instead of find_package
 
 * 2019-09-24 Marko Petric ([PR#564](https://github.com/AidaSoft/DD4hep/pull/564))
   - Added test for Python3 compliance of code
   - Added test to require flake8 python code formatting
 
 * 2019-09-13 Marko Petric ([PR#540](https://github.com/AidaSoft/DD4hep/pull/540))
   - Make python code compatible to python 2 and 3
     - add `absolute_import` and `unicode_literals` to all files
       - fix API calls and cast `unicode` to `string` when needed
     - replace print statement with logging
     - remove old octal literal
     - use future division
     - use `six`:
        - replace `dict.iteritems` with `six.iteritems`
        - replace `xrange` with `range` from `six.move`
        - replace `basestring` with `six.string_types`
        - replace `raw_input` with `input` from `six.moves`
        - added a copy of six.py named ddsix.py to DDCore
     - Replace deprecated `execfile` with call to `open`, `compile` and `exec`
     - Remove usage of `apply`
     - use `io.open` instead of standard `open`
     - convert `except a,b` to `except a as b`
     - change `dict.has_key` to `key in dict`
   - Require DD4hep Python3 CI tests to pass
   - Remove obsolete `lcdd.py`
   - Remove deprecated `SystemOfUnits.py` and replace everywhere with `g4units.py`
   - Flake8 all files
 
 * 2019-09-02 Andre Sailer ([PR#561](https://github.com/AidaSoft/DD4hep/pull/561))
   - CMake: add option `DD4HEP_BUILD_PACKAGES` so that only individual packages can be compiled. If an incorrect selection is given cmake should fail due to missing alias libraries. The option requires a whitespace or semicolon separated list.
   - CMake add option `DD4HEP_BUILD_EXAMPLES` to enable compilation of examples together with the main DD4hep packages. Default OFF
   - CMake: add `DD4hep::` aliases for all libraries and some executables
 
 * 2019-08-26 Andre Sailer ([PR#559](https://github.com/AidaSoft/DD4hep/pull/559))
   - DD4hepConfig: make all DD4HEP_USE variables behave as booleans
 
 * 2019-08-22 Markus Frank ([PR#554](https://github.com/AidaSoft/DD4hep/pull/554))
   - Fix property table translation to Geant4 according to suggestions from Dong Liu
     (see issue https://github.com/AIDASoft/DD4hep/issues/440 )
 
 * 2019-08-22 Andre Sailer ([PR#552](https://github.com/AidaSoft/DD4hep/pull/552))
   * DD4hepConfig: `DD4hepConfig.CMake` now exports `DD4hep::DDCore` `DD4hep::<Component>` targets to be consumed by users of the DD4hep package, the CMake variables `DD4hep_LIBRARIES` etc. are still being filled for backward compatibility
   
   * DD4hep CMake: Only the `dd4hep_add_plugin` and `dd4hep_add_dictionary` CMake functions are to create targets still exist, `dd4hep_add_package`/`library`/`executable` were removed and instead the cmake `default add_library`/`executable` have to be used.
   
   * PluginManager: only link against boost filesystem if the compiler and standard library do not support the filesystem library
   
   * DD4hep Requirements: Now require cmake version 3.12
   
   * DD4hep Requirements: Now require c++ standard 14
 
 * 2019-08-21 Markus Frank ([PR#553](https://github.com/AidaSoft/DD4hep/pull/553))
   - Fix unit conversion for optical surface properties. The units of the property tables were not converted from TGeo to Geant4. See dicussion in issue https://github.com/AIDASoft/DD4hep/issues/440
   - If an external world volume is supplied, the material `Air` is deduced from this solid (only used by CMS).
 
 * 2019-08-15 Frank Gaede ([PR#550](https://github.com/AidaSoft/DD4hep/pull/550))
   - make compatible with MacOS (10.14.6)
        - address latest developments w/ new Gaudi Plugin Manager
 
 * 2019-08-14 Markus Frank ([PR#551](https://github.com/AidaSoft/DD4hep/pull/551))
   - Moved `setDimensions` call out of the individual dd4hep shapes into the base Solid.
   - Add `Solid::dimensions()`, `Solid::setDimension()` implementation for `PseudoTrap` and  `TruncatedTube`. The solution is not optimal, because a analytical solution tends to be ambiguous due to solutions of polynomials of degree 2 and the initial parameters had to be stored as a string.
   - Upgraded shape tests to also check the shapes (using mesh vertices) after a re-dimension using the same parameters.
   - Geant4FieldTrackingSetup: Any failure in the creation of the `G4EquationOfMotion` or the `G4MagIntegratorStepper` is now FATAL and causes an exception.
 
 * 2019-08-12 Markus Frank ([PR#549](https://github.com/AidaSoft/DD4hep/pull/549))
   - Adopted new Gaudi plugin manager V2. V1 can be enabled using compile switch in `DD4hep/config.h`. Removed the traces from the ROOT5 Reflex based plugin service. The new plugin service depends on `Boost::file_system` and `Boost::system`. 
   - Improve GDML saving from ROOT. (requires ROOT >= 6.20)
   - Fix ROOT persistency for the volume manager.
   - Fix Geant4FieldTrackingSetup: Issue warning if the `G4MagIntegratorStepper` cannot be created.
   - Examples: based the CLICSiD example on the XML sources of DDDetectors. This ensures XML sources match C++ sources.
 
 * 2019-08-12 Andre Sailer ([PR#548](https://github.com/AidaSoft/DD4hep/pull/548))
   - Shapes: fix conversion of `startTheta` for Sphere::setDimensions
   - Shapes::get_shape_dimension: add return value conversion for angles to internal unit (radians)
 
 * 2019-08-12 MarkusFrankATcernch ([PR#547](https://github.com/AidaSoft/DD4hep/pull/547))
   - make compatible w/ macos (c++14)
            - replace `std::make_any` w/ make_any (defined in Any.h)
            - use `std::lock_guard<std::mutex>`
 
 * 2019-08-07 MarkusFrankATcernch ([PR#545](https://github.com/AidaSoft/DD4hep/pull/545))
   - Fix bug in Polyhedra shape (See #544).
   - Update optical surface example (resolves #440) .
 
 * 2019-07-16 Markus Frank ([PR#539](https://github.com/AidaSoft/DD4hep/pull/539))
   - Remove clang warnings.
 
 * 2019-07-16 MarkusFrankATcernch ([PR#538](https://github.com/AidaSoft/DD4hep/pull/538))
   - Fix coverity errors 
   - Fix Trap shape conversion to Geant4. The theta/phi angle was not converted from degree to radians (Resolves #536).
 
 * 2019-07-15 Marko Petric ([PR#537](https://github.com/AidaSoft/DD4hep/pull/537))
   - Add a Python 3 pipeline to the CI (currently set to `allow_failure`)
 
 * 2019-07-13 Marko Petric ([PR#535](https://github.com/AidaSoft/DD4hep/pull/535))
   - Update CI to be based on LCG 96 (ROOT 6.18, Geant 10.5, C++17)
   - Remove `FindXercesC.cmake` since it is in CMake
 
 * 2019-07-10 Markus Frank ([PR#533](https://github.com/AidaSoft/DD4hep/pull/533))
   - Optimize STL containers: replace insert/push with emplace. 2nd. episode.
 
 * 2019-07-10 Marko Petric ([PR#532](https://github.com/AidaSoft/DD4hep/pull/532))
   - Remove `dd_sim` (resolves #435)
 
 * 2019-07-10 Marko Petric ([PR#531](https://github.com/AidaSoft/DD4hep/pull/531))
   - Remove shadow warnings related to code interfacing only ROOT 6.18
   - Add `DBoost_NO_BOOST_CMAKE=ON` to examples cmake call as it is necessary now
   - Set CMP0074 policy to NEW if can be set
 
 * 2019-07-10 Markus Frank ([PR#530](https://github.com/AidaSoft/DD4hep/pull/530))
   - Optimize STL containers: replace insert/push with emplace
 
 * 2019-07-09 Markus Frank ([PR#528](https://github.com/AidaSoft/DD4hep/pull/528))
   * Allow for various material scan types from the root interactove prompt
   
          Examples: from DDDetectors/compact/SiD.xml
          $> materialScan file:checkout/DDDetectors/compact/SiD.xml -interactive
        
          1) Simple scan:
             root [0] gMaterialScan->print(5,5,0,5,5,400)
          2) Scan a given subdetector:
             root [0] de=gDD4hepUI->instance()->detector("LumiCal");
             root [1] gMaterialScan->setDetector(de);
             root [2] gMaterialScan->print(5,5,0,5,5,400)
          3) Scan by material:
             root [0] gMaterialScan->setMaterial("Silicon");
             root [1] gMaterialScan->print(5,5,0,5,5,400)
          4) Scan by region:
             root [0] gMaterialScan->setRegion("SiTrackerBarrelRegion");
             root [1] gMaterialScan->print(0,0,0,100,100,0)
   
   * Added copyright notices to the DDRec files.
 
 * 2019-07-09 Marko Petric ([PR#527](https://github.com/AidaSoft/DD4hep/pull/527))
   - Update CI to macOS Mojave 10.14
   - Make `PluginService.cpp` C++17 compliant (addresses partially #525)
     - replace `ptr_fun` with `lambda`
   - Remove deprecated code that uses `auto_prt`
   - Remove deprecated `set_unexpected` from  `DetectorImp.cpp`
   - Remove code associated to `DD4HEP_DD4HEP_PTR_AUTO`
 
 * 2019-07-08 Markus Frank ([PR#524](https://github.com/AidaSoft/DD4hep/pull/524))
   - Get the new package formally into the same shape as the other packages together with an example section.
   - Add small example to test the basic development framework
 
 * 2019-07-04 Markus Frank ([PR#520](https://github.com/AidaSoft/DD4hep/pull/520))
   - From ROOT 6.20 onwards dd4hep shall use the Geant4 unit system (mm, nsec, MeV) instead of the TGeo units (cm, sec, keV). This commit prepares for the necessary changes.
   - A new package was created, which shall host the dd4hep digitization components.
     A small tbb based multi threaded framework was put in place. Now the real work can start.
   - The material scanner has now a switch to run in interactive mode from the ROOT prompt.
     To invoke: materialScan compact.xml  x0 y0 z0 x1 y1 z1 -interactive
     If the interactive switch is missing, the old behavior is preserved.
 
 * 2019-06-26 Markus Frank ([PR#517](https://github.com/AidaSoft/DD4hep/pull/517))
   - Material properties use now default dd4hep units
   - Translated and updated surface example from geant4 to dd4hep
   - Added shape identification using `instanceOf operator (function)`
   - Improved handling of xml files if improperly terminated
 
 * 2019-06-26 MarkusFrankATcernch ([PR#516](https://github.com/AidaSoft/DD4hep/pull/516))
   - CMakeLists: Changed the order in which include directories are listed when compiling, move DD4hep source paths to the front. This fixes a problem if older DD4hep installations are inadvertently in one of the include paths passed to compilers or rootcling (e.g., in LCG Views), fixes #515
 
 * 2019-06-06 Andre Sailer ([PR#514](https://github.com/AidaSoft/DD4hep/pull/514))
   - Gean4ExtraParticles: no longer add decay process to extra particles, this is done by Geant4  resolves #513 
   - ddsim: disable physics.decays by default. This should only be enabled if completely new physics lists are created resolves #513
 
 * 2019-05-09 Markus Frank ([PR#510](https://github.com/AidaSoft/DD4hep/pull/510))
   - Add debug printout of MEE in Geant4 material conversion
 
 * 2019-04-29 MarkusFrankATcernch ([PR#508](https://github.com/AidaSoft/DD4hep/pull/508))
   * Geant4GDMLWriteAction:
     * Add properties to Geant4GDMLWriteAction to steer writing of regions, cuts and sensitive detectors. See github issue #507
       * Property: Export region information to the GDML: ExportRegions, default: True
       * Property: Export energy cut information to the GDML: ExportEnergyCuts, default: True
       * Property: Export sensitive detector information to the GDML: ExportSensitiveDetectors, default: True
     * **Note: The Geant4 physics list must be initialized BEFORE invoking the writer with options. Otherwise the particle definitions are missing! If you ONLY want to dump the geometry to GDML you must call**
       ```
          /run/beamOn 0
       ```
       before writing the GDML file!
       You also need to setup a minimal generation action like:
        ```py
        sid.geant4.setupGun('Gun','pi-',10*GeV,Standalone=True)
        ```
 
 * 2019-04-29 Frank Gaede ([PR#506](https://github.com/AidaSoft/DD4hep/pull/506))
   - add utility materialBudget.cpp 
        - create plots w/ integrated radiation and interaction lengths
   - bug fix in materialScan.cpp
        - print correct endpoint
 
 * 2019-04-17 Marko Petric ([PR#503](https://github.com/AidaSoft/DD4hep/pull/503))
   - DDG4: DDSim add option Physics.zeroTimePDG to configure ignoring particles of given PDG when their properTime is ZERO, e.g. charged leptons undergoing FSR, fixes #390 
   - DDG4: DDSim: fix parsing of rejectPDGs values from the command line
 
 * 2019-04-12 Marko Petric ([PR#502](https://github.com/AidaSoft/DD4hep/pull/502))
   - DDSim: Add Higgs PDG code 25 to rejected codes for reading events
 
 * 2019-04-10 MarkusFrankATcernch ([PR#501](https://github.com/AidaSoft/DD4hep/pull/501))
   - Add access to all Geant4Action derivatives to the Geant4 top level physical volume (world).
   - Add Geant4 GDML writer action accessible and configurable from the Geant4 prompt
 
 * 2019-04-09 Mircho Rodozov ([PR#496](https://github.com/AidaSoft/DD4hep/pull/496))
   - Added powerpc macros check to include header `cxxabi.h`
 
 * 2019-04-01 Markus Frank ([PR#494](https://github.com/AidaSoft/DD4hep/pull/494))
   -  Use shared_ptr instead of home made ref counting for ConditionUpdateCalls
   -  Implement construction parameter access for solids.  This one is a bit tricky: Some shapes (ShapeAssembly, Boolean shapes) had no such parameters. Added them as the sequence of the basic shape parameters + the corresponding matrices.
   -  Add move constructors to handles 
   -  Improve const-ness of detector object in DDG4
 
 * 2019-03-11 Markus Frank ([PR#491](https://github.com/AidaSoft/DD4hep/pull/491))
   - Implemented basic handles to support surface objects
   - Implemented import of surface optical objects in compact to create TGeo surface objects and tabulated properties.
   - Implemented the translation from TGeo to Geant4
   - Added physics components for DDG4 handling Cerekov, Scintillation and generic optical photon physics
   - Added examples
   
   Please Note: 
   1) This is only enabled for a ROOT version > 6.17 (which is supposed to come)
   2) There are still changes in ROOT in the pipeline. The code shall have to be adapted accordingly once these changes are activated.
 
 * 2019-03-06 ebrianne ([PR#489](https://github.com/AidaSoft/DD4hep/pull/489))
   - Added Initialization of G4EmSaturation to initialize birks coefficients - for g4 version > 10.03
 
 * 2019-02-19 Andre Sailer ([PR#486](https://github.com/AidaSoft/DD4hep/pull/486))
   - DDRec: Surface: add accessor to DetElement member
   - DDRec: DetectorData: add Extension holding a map of String to Doubles
 
 * 2019-02-14 Paul Gessinger ([PR#485](https://github.com/AidaSoft/DD4hep/pull/485))
   * In `DD4hepConfig.cmake`, figure out if build has compatible standard set and print error if not
 
 * 2019-02-13 Frank Gaede ([PR#483](https://github.com/AidaSoft/DD4hep/pull/483))
   - fix drawing of surfaces for z-disks and cylinders (resolves #482)
 
 # v01-10
 
 * 2019-01-31 Markus Frank ([PR#480](https://github.com/aidasoft/dd4hep/pull/480))
   - Fix bug in `geoDisplay` to allow passing the volume display depth as an argument
   - Added a static creator to the Detector class to create non-traced instances: `std::unique_ptr<Detector> Detector::make_unique(const std::string& name);` It is the users responsibility to release the allocated resources and to avoid clashed with existing `TGeoManager` instances.
   -  Allow direct access to the solid instance of the DetElements's placement.
 
 * 2019-01-15 Markus Frank ([PR#478](https://github.com/aidasoft/dd4hep/pull/478))
   - Fix bug in `geoDisplay` see #477
 
 * 2019-01-10 Markus Frank ([PR#476](https://github.com/aidasoft/dd4hep/pull/476))
   - Fix bug in ConditionsUserPool whan scanning DetElement conditions
   - Improve conditions handling: Allow to bind sub-class entities of ConditionObject to thew opaque data block.
 
 * 2018-12-14 Markus Frank ([PR#475](https://github.com/aidasoft/dd4hep/pull/475))
   - Add named shape constructors (see #469)
 
 * 2018-12-13 Markus Frank ([PR#474](https://github.com/aidasoft/dd4hep/pull/474))
   - Fix possible access violation
 
 * 2018-12-13 MarkusFrankATcernch ([PR#473](https://github.com/aidasoft/dd4hep/pull/473))
   - Improve handling of condition dependencies ( main work item)
     - Improve logic flow in the DDCond/ConditionDependencyHandler
     - Improve the functionality of the conditions resolver accessible from the update context. Allow for the creation (and registration) of multiple conditions in one single callback.
   - Add a shape check for eight-point solids.
 
 * 2018-12-07 Frank Gaede ([PR#470](https://github.com/aidasoft/dd4hep/pull/470))
   - add `#include <memory>` to `run_plugin.h` (needed for `std::unique_ptr` and gcc 4.9)
 
 * 2018-12-06 Markus Frank ([PR#468](https://github.com/aidasoft/dd4hep/pull/468))
   - To fix issue #466  we had to go back to the original implementation which was actually correct (see https://github.com/AIDASoft/DD4hep/commit/36d4b01e0688f690ac2e506a62e00627bb6b798c#diff-7219d47bc4ab7516e0ca6c4f35f2602f).
   - Added an example to show how to perform scans of the volume hierarchy with user defined callback functors. See for details `examples/ClientTests/src/PlacedVolumeScannerTest.cpp`.
   
   - Added conversion between `TGeoArb8` and `G4GenericTrap`, fixes #465
 
 * 2018-12-05 Markus Frank ([PR#467](https://github.com/aidasoft/dd4hep/pull/467))
   - Harmonize argument names in `Shapes.h` with their actual functionality. For many shapes in `DD4hep/Shapes.h` the argument names were misleading: very often deltaPhi was mentioned, whereas the code actually used instead of (phi, deltaphi) the input arguments to the ROOT constructors (startPhi,endPhi) or (phi1, phi2).  Wherever ROOT uses (startPhi,endPhi) the argument names were changed accordingly. Please note a bug was found in the legacy constructor:
     ```cpp
       /// Legacy: Constructor to create a new identifiable tube object with attribute initialization
       Tube(const std::string& nam, double rmin, double rmax, double dz, double startPhi, double endPhi)
     ```
     Here opposite to all other constructors delta_phi was used as such - in contradiction to other constructors of the same class. This was rectified.
 
 * 2018-11-30 Andre Sailer ([PR#462](https://github.com/aidasoft/dd4hep/pull/462))
   - Introduce compile flag to minimize conditions footprint
 
 * 2018-11-27 Markus Frank ([PR#461](https://github.com/aidasoft/dd4hep/pull/461))
   - Add shape constructor for regular trapezoids (TGeoTrd1) ( see #460). Trd2 cannot be divided the same way as Trd1 shapes. Hence the addition became necessary. Due to the imprecise name of Trapezoid the names Trd1 and Trd2 (aka old Trapezoid) are favored. The usage of Trapezoid is supported for backwards compatibility using a typedef.
 
 * 2018-11-22 Markus Frank ([PR#459](https://github.com/aidasoft/dd4hep/pull/459))
   - Fix bug in DDCodex geometry, add debugging to VolumeBuilder
 
 * 2018-11-14 Markus Frank ([PR#458](https://github.com/aidasoft/dd4hep/pull/458))
   - Improve ROOT persistency: flag user extensions as persistent only while saving/loading
   - Need to rename DDEve library: nameclash with ddeve executable on Apple: cmake fails to build ddeve as exe and DDEve as library. libDDEve.so is now called libDDEvePlugins.so.
 
 * 2018-11-13 Markus Frank ([PR#457](https://github.com/aidasoft/dd4hep/pull/457))
   ## Provide support for Volume divisions.
   Since DD4hep requires Volumes (aka `TGeoVolume`) and PlacedVolumes (aka `TGeoNode`) to be enhanced with the user extension mechanism, therefore shape divisions **must** be done using the division mechanism of the DD4hep shape or the volume wrapper. Otherwise the enhancements are not added and you will get an exception when DD4hep is closing the geometry or whenever you do something with the volume, which is served by the user extension. The same argument holds when a division is made from a `Volume`. Unfortunately there is no reasonable way to intercept this call to the `TGeo` objects - except to the sub-class each of them, which is not really acceptable either.
   
   Hence: **If you use DD4hep: Never call the raw TGeo routines.**
      
   For any further documentation please see the following ROOT documentation on [TGeo](http://root.cern.ch/root/html/TGeoVolume.html)
   
   For an example see `examples/ClientTests/src/VolumeDivisionTest.cpp`
   and `examples/ClientTests/compact/VolumeDivisionTest.xml`
   
   To execute: 
   ```
   geoDisplay -input file:<path>/examples/ClientTests/compact/VolumeDivisionTest.xml
   ```
 
 * 2018-11-13 Hadrien Grasland ([PR#438](https://github.com/aidasoft/dd4hep/pull/438))
   - Make FindPackage(DD4hep) work even if thisdd4hep.sh was not sourced
 
 * 2018-11-09 Frank Gaede ([PR#456](https://github.com/aidasoft/dd4hep/pull/456))
   - add `#include <memory>` in `VolumeAssembly_geo.cpp` gcc 4.9 compatibility
 
 * 2018-11-07 Markus Frank ([PR#455](https://github.com/aidasoft/dd4hep/pull/455))
   - Improve VolumeBuilder pattern matcher
   - Allow XML based volume creation based on factories.
 
 * 2018-11-02 Markus Frank ([PR#454](https://github.com/aidasoft/dd4hep/pull/454))
   - Improve generic Volume assembly and XML volume builder
 
 * 2018-11-01 Markus Frank ([PR#452](https://github.com/aidasoft/dd4hep/pull/452))
   - Fixed the DetElement cloning mechanism it to properly replicate DetElement trees.
     - Tested with one LHCb upgrade detector.
   - Added numeric epsilon to the default math dictionary of the expression evaluator:
     ```cpp
     int:epsilon  --> std::numeric_limits<int>::epsilon()
     long:epsilon  --> std::numeric_limits<long>::epsilon()
     float:epsilon  --> std::numeric_limits<float>::epsilon()
     double:epsilon  --> std::numeric_limits<double>::epsilon()
     ```
 
 * 2018-10-30 Markus Frank ([PR#451](https://github.com/aidasoft/dd4hep/pull/451))
   - Add copyright notices
   - Make ddeve a program not only a ROOT script
 
 * 2018-10-30 Markus Frank ([PR#450](https://github.com/aidasoft/dd4hep/pull/450))
   - The DDUpgrade example was removed from the main repository. Since it is only of interest for LHCb, it moved to a separate repository at CERN/gitlab.
   - Issue #449 should be fixed now.
   - The XML volume builder utility was improved.
 
 * 2018-10-18 Markus Frank ([PR#447](https://github.com/aidasoft/dd4hep/pull/447))
   -  Fix plugin manager cmake file by removing explicit dependency on c++ standard.
 
 # v01-09
 
 * 2018-10-15 Markus Frank ([PR#442](https://github.com/aidasoft/DD4hep/pull/442))
   - DDCMS: Update to support namespaces
   - DDUpgrade test example for the LHCb upgrade
   - Fix nested detectors (in fact worked only for first level parents)
   - Add VolumeBuilder XML utility to work on XML-tree patterns
 
 * 2018-09-12 Hadrien Grasland ([PR#437](https://github.com/aidasoft/DD4hep/pull/437))
   - Remove if string equals ON/OFF in cmake IF statements and check default CMake truth values
 
 * 2018-08-20 Oleksandr Viazlo ([PR#434](https://github.com/aidasoft/DD4hep/pull/434))
   - DD4hep_Mask_o1_v01_geo
     - allow rotation around x-axis (instead of y)
     - phi1 and phi2 cone angles configurable from the xml-file
 
 * 2018-08-10 Markus Frank ([PR#433](https://github.com/aidasoft/DD4hep/pull/433))
   - Fix DDCMS example to use true namespace names rather than using "_"
     This should resolve issue https://github.com/AIDASoft/DD4hep/issues/421
 
 * 2018-08-09 Markus Frank ([PR#432](https://github.com/aidasoft/DD4hep/pull/432))
   - Make the expression evaluator understand variable names with namespaces
       - Variable names containing a `:` or `::` are now accepted by the expression evaluator. This is first step towars resolving #421 
      - It has now to be seen what has to be done further. The DCMS example was not yet updated to use this feature.
   - Add new example in `examples/ClientTests` to test this functionality.
 
 * 2018-08-09 Andre Sailer ([PR#429](https://github.com/aidasoft/DD4hep/pull/429))
   - DDG4: add possibility to simulate all events in a file by passing NumberOfEvents < 0. Fixes #237 
      * The de-facto limit is ~2 billion, which should be fine for input files.
 
 * 2018-08-08 Markus Frank ([PR#430](https://github.com/aidasoft/DD4hep/pull/430))
   - Fix HEPMC reader for unknown generator status codes 
   - Update DDCodex example, feature imports from plain ROOT file 
   - Allow debugging Geant4VolumeManager
 
 * 2018-08-07 Mircho Rodozov ([PR#428](https://github.com/aidasoft/DD4hep/pull/428))
   - Adapt to root interfaces changes for `TGeoMatrix::Inverse` (https://github.com/root-project/root/pull/2365), fixes #426
 
 * 2018-08-06 Andre Sailer ([PR#424](https://github.com/aidasoft/DD4hep/pull/424))
   - CMake: Ensure proper tls flag (global-dynamic) for Geant4 build, added option DD4HEP_IGNORE_GEANT4_TLS  to override the check. Closes #419
 
 * 2018-07-31 Andre Sailer ([PR#420](https://github.com/aidasoft/DD4hep/pull/420))
   - DDG4: Import the ddsim python program from https://github.com/iLCSoft/lcgeo
     For example:
      - `ddsim --help`
      - `ddsim --dumpSteeringFile > mySteer.py`
      - `ddsim --steeringFile=mySteer.py --compactFile myDetector.xml`
 
 # v01-08
 
 * 2018-07-02 Markus Frank ([PR#418](https://github.com/aidasoft/dd4hep/pull/418))
   - Add DDCodexB in standalone mode with simulation script and basic skeleton for DDEve
 
 * 2018-06-28 Markus Frank ([PR#417](https://github.com/aidasoft/dd4hep/pull/417))
   - Steer debug printouts in CondDB2DDDB and DDDB2Objects by parsing xml files.
 
 * 2018-06-26 Markus Frank ([PR#416](https://github.com/aidasoft/dd4hep/pull/416))
   - Separate the hit class and add dictionary. No base class - entirely independent.
   - Allow to save the hit class to ROOT (but without MC truth)
     See MyTrackerHit.h for details.
 
 * 2018-06-26 Markus Frank ([PR#415](https://github.com/aidasoft/dd4hep/pull/415))
   - Add small example how to specialize a new sensitive action and attach it to a detector in DDG4.
 
 * 2018-06-26 Frank Gaede ([PR#414](https://github.com/aidasoft/dd4hep/pull/414))
   - bug fix in Geant4EventReaderGuineaPig
        - fix ignoring input lines with 'nan'
 
 * 2018-06-26 Shaojun Lu ([PR#412](https://github.com/aidasoft/dd4hep/pull/412))
   - Added one more if statement: If the track went into new Volume, 
     - then extracted the hit in previous Volume,
     - and start a new hit in this current Volume,
       - in this current process, also allow the same following treatments for the new hit.
 
 * 2018-06-21 Markus Frank ([PR#409](https://github.com/aidasoft/dd4hep/pull/409))
   - Support out-of-source builds of DD4hep examples.
     Comes with an expense: A new environment DD4hepExamplesINSTALL.
     has to be defined to support internal file accesses and loads.
     The builds were also checked with read-only installation directories.
     Solves issue https://github.com/AIDASoft/DD4hep/issues/382
   - Smallish improvement to the ConditionsManager.
 
 * 2018-06-21 Andre Sailer ([PR#408](https://github.com/aidasoft/dd4hep/pull/408))
   - Cmake: fix for configuring with Geant4 with internal CLHEP, fixes #406 
   - Cmake: fix for configuring with BUILD_TESTING=OFF, fixes #407
 
 * 2018-06-07 Markus Frank ([PR#404](https://github.com/aidasoft/dd4hep/pull/404))
   - Fix basic shape tests for PseudoTrap
 
 * 2018-06-07 Markus Frank ([PR#403](https://github.com/aidasoft/dd4hep/pull/403))
   - patch for truncated tubes shapes.
 
 * 2018-06-04 Markus Frank ([PR#402](https://github.com/aidasoft/dd4hep/pull/402))
   - Fix truncated tube shape
 
 * 2018-06-04 Markus Frank ([PR#400](https://github.com/aidasoft/dd4hep/pull/400))
   - Allow for world volumes other than boxes. See `examples/ClientTests/compact/WorldVolume.xml` how to set it up. The effective thing is that the top level volume must be set to the TGeoManager before `Detector::init()`. If a top level volume is set, it is implicitly assumed to be the world volume. Otherwise the already existing mechanism (box volume) is activated.
   - Add new basic shape tests.
 
 * 2018-06-01 Markus Frank ([PR#399](https://github.com/aidasoft/dd4hep/pull/399))
   - As discussed in issue #398 The use of TGeoUnits is inconvenient. The dd4hep units are now exposed in the python modules.
   - Basic shapes are now tested in the regular ctest executions. The mesh vertices of the shapes were 
   saved to a reference file and are compared to in subsequent runs. The reference files reside in 
   `examples/ClienTests/ref`. See `examples/ClientTests/compact/Check_Shape_*.xml` for details.
   - The ROOT UI  and some dump plugins were enhanced to expose more information.
 
 * 2018-05-30 Markus Frank ([PR#397](https://github.com/aidasoft/dd4hep/pull/397))
   - Enable to start DDG4 using a saved detector description in a ROOT file.
      -  Added corresponding test: `Persist_CLICSiD_Geant4_LONGTEST`
   - Fix shape constructors for Trap and PseudoTrap
   - The python module `DD4hep.py` is gone as discussed in the developers meeting use `dd4hep.py` instead.
       - on masOS : your "git pull" possibly deletes both files. you may have to checkout `dd4hep.py` again, due to fact that the filesystem is case-insensitive. 
   - Add example for LHCb CODEX-b.
 
 * 2018-05-29 Markus Frank ([PR#394](https://github.com/aidasoft/dd4hep/pull/394))
   - Consistently handle cmake command line options in case no Geant4 or no documentation should be built.
 
 * 2018-05-28 Markus Frank ([PR#393](https://github.com/aidasoft/dd4hep/pull/393))
   - Improvements to `geoPluginRun`.
     `$> geoPluginRun -ui -interactive`
     results in DD4hep enabled ROOT prompt.
   - DD4hepUI: improvements to interact with DD4hep instance from ROOT prompt
   - DDDB improve configuration for printing and debugging
   - DDDB: allow to block certain XML branches
 
 * 2018-05-22 Frank Gaede ([PR#389](https://github.com/aidasoft/dd4hep/pull/389))
   - fix bug in input handling, for details see discussion #387 
      - exclude leptons with zero lifetime from Geant4
 
 * 2018-05-22 Markus Frank ([PR#388](https://github.com/aidasoft/dd4hep/pull/388))
   - Update doxygen information for some undocumented classes. 
    - Add licence header to files where not present.
 
 * 2018-05-22 Marko Petric ([PR#380](https://github.com/aidasoft/dd4hep/pull/380))
   - Update LICENSE to LGPLv3
     - The name of the file containing the LICENSE has ben changed from LICENCE->LICENSE as all source files reference `For the licensing terms see $DD4hepINSTALL/LICENSE.`
 
 * 2018-05-16 Markus Frank ([PR#386](https://github.com/aidasoft/dd4hep/pull/386))
   - Fix bug in variable order of `ExtrudedPolygon` (x<->y)
 
 * 2018-05-15 Markus Frank ([PR#384](https://github.com/aidasoft/dd4hep/pull/384))
   # Implementation of non-cylindrical tracking region (resolves #371)
     -  It is possible to define volumes in a parallel world such as e.g. a tracking region. In principle any volume hierarchy may be attached to the parallel world. None of these volumes participate in the tracking as long as the "connected" attribute is set to false. The hierarchy of parallel world volumes can be accessed from the main detector object using
        ```cpp
        dd4hep::Volume parallel = dd4hep::Description::parallelWorldVolume()
        ```
     This parallel world volume is created when the geometry is opened together (and with the same dimensions) as the world volume itself.
     -  IF the NAME of the volumes is "tracking_volume" within the compact notation it is declared as the Detector's trackingVolume entity and is accessible as well:
        ```cpp
        dd4hep::Volume trackers = dd4hep::Description::trackingVolume()
        ```
     -  Although the concept is available in the DD4hep core, its configuration from XML is only implemented for the compact notation. For details see the example `examples/ClientTests/compact/TrackingRegion.xml`.
      -  If the volume should be connected to the world:   connected="true". This is useful for debugging because  the volume can be visualized else if the volume is part of the parallelworld: connected="false". The volume is always connected to the top level. The anchor detector element defines the base transformation to place the volume within the (parallel) world.
   
   ```xml
        <parallelworld_volume name="tracking_volume" anchor="/world" material="Air" connected="true" vis="VisibleBlue">
          <shape type="BooleanShape" operation="Subtraction">
            <shape type="BooleanShape" operation="Subtraction">
              <shape type="BooleanShape" operation="Subtraction"  >
                <shape type="Tube" rmin="0*cm" rmax="100*cm" dz="100*cm"/>
                <shape type="Cone" rmin2="0*cm" rmax2="60*cm" rmin1="0*cm" rmax1="30*cm" z="40*cm"/>
                <position x="0*cm" y="0*cm" z="65*cm"/>
              </shape>
              <shape type="Cone" rmin1="0*cm" rmax1="60*cm" rmin2="0*cm" rmax2="30*cm" z="40*cm"/>
              <position x="0" y="0" z="-65*cm"/>
            </shape>
            <shape type="Cone" rmin2="0*cm" rmax2="55*cm" rmin1="0*cm" rmax1="55*cm" z="30*cm"/>
            <position x="0" y="0" z="0*cm"/>
          </shape>
          <position x="0*cm"   y="50*cm" z="0*cm"/>
          <rotation x="pi/2.0" y="0"     z="0"/>
        </parallelworld_volume>
   ```
   
   
   # Enhancement of assemblies, regions and production cuts (resolves #373)
   On request from FCC particle specific production cuts may be specified in the compact notation. These production cuts (Geant4 currently supports these for e+, e-, gammas and protons) are specified as "cut" entities in the limitset. (See the example `examples/ClientTests/compact/Assemblies.xml`).
   
     - The hierarchy of cuts being applied is:
         - If present particle specific production cuts for a region are applied.
         - else the "cut" attribute of the compact region specification is used
         - else the global Geant4 cut is automaticallly applied by Geant4.
   
   ```xml
     <limits>
       <limitset name="VXD_RegionLimitSet">
         <!--
              These are particle specific limits applied to the region
              ending in Geant4 in a G4UserLimits instance
         -->
         <limit name="step_length_max"  particles="*" value="5.0" unit="mm" />
         <limit name="track_length_max" particles="*" value="5.0" unit="mm" />
         <limit name="time_max"         particles="*" value="5.0" unit="ns" />
         <limit name="ekin_min"         particles="*" value="0.01" unit="MeV" />
         <limit name="range_min"        particles="*" value="5.0" unit="mm" />
   
         <!--
              These are particle specific production cuts applied to the region
              ending in Geant4 in a G4ProductionCuts instance
         -->
         <cut   particles="e+"          value="2.0"   unit="mm" />
         <cut   particles="e-"          value="2.0"   unit="mm" />
         <cut   particles="gamma"       value="5.0"   unit="mm" />
       </limitset>
     </limits>
   ```
   
   # SensitiveDetector types not changed by Geant4SensDetActionSequence (resolves #378)
   The sensitive detector type defined in the detector constructors is no longer changed intransparently in the back of the users. This may have side-effects for creative detector constructor writers, who invent sd types out of the sky. These obviously will not work with Geant4, because in Geant4 a mapping of these types must be applied to supported sensitive detectors. Now the mapping of a sd type (e.g. "tracker") is strict in the python setup. The default factory to create any sensitive detector instance in Geant4 (ie. an object of type G4VSensitiveDetector, G4VSDFilter, Geant4ActionSD) is a property of the Geant4Kernel  instance and defaults to:
     ```cpp
      declareProperty("DefaultSensitiveType", m_dfltSensitiveDetectorType = "Geant4SensDet");
     ```
      - Since the actual behavior is defined in the sequencer instanciated therein this default should be sufficient for 99.99 % of all cases. Otherwise the factory named "Geant4SensDet" may be overloaded.
 
 * 2018-05-15 David Blyth ([PR#379](https://github.com/aidasoft/dd4hep/pull/379))
   - Geant4FieldTrackingConstruction now properly overrides `constructField()`
 
 * 2018-05-03 David Blyth ([PR#377](https://github.com/aidasoft/dd4hep/pull/377))
   - Geant4Handle unhandled reference to shared actions.  This affected the destruction of shared actions.
 
 * 2018-05-03 Markus Frank ([PR#375](https://github.com/aidasoft/dd4hep/pull/375))
   - Development of a small user example on how to do analysis in `DDG4`.
      - See `examples/DDG4/src/HitTupleAction.cpp`
      - Simply collect the energy deposits of hits and write an N-tuple with them.
      - The example shows how to access the hit collections and to extract the data in order to write other more sophisticated analyses.
   
    - This `DDG4` action is used in one of the Minitel examples: `examples/ClientTests/srcipts/MiniTelEnergyDeposits.py`
 
 * 2018-05-02 Markus Frank ([PR#374](https://github.com/aidasoft/dd4hep/pull/374))
   - recommission the multithreaded SiD example 
      - `DDG4/examples/SiDSim_MT.py` vs. `DDG4/examples/SiDSim.py`
 
 * 2018-04-19 Markus Frank ([PR#370](https://github.com/aidasoft/dd4hep/pull/370))
   * Allow to disable building the documentation cmake option BUILD_DOCS. By default ON and backwards compatible. If set to OFF no doc shall be built. (not everybody has biber installed)
   * Move from `DD4hep.py` to `dd4hep.py`, since `DD4hep.py` has to disappear due to conflicts on MAC.
 
 * 2018-04-13 Markus Frank ([PR#367](https://github.com/aidasoft/dd4hep/pull/367))
   - resolves #361
     The Detector object has a state `Detector::state()` with three values:
     ```cpp
       /// The detector description states
       enum State   {
         /// The detector description object is freshly created. No geometry nothing.
         NOT_READY = 1<<0,
         /// The geometry is being created and loaded. (parsing ongoing)
         LOADING   = 1<<1,
         /// The geometry is loaded.
         READY     = 1<<2
       };
     ```
       It starts with `NOT_READY`, moves to `LOADING` once the geometry is opened and goes to `READY` once the geometry is closed. As suggested in the developers meeting: the initial field object is invalid and gets created only once the geometry is opened. As a corollary, the field may not be accessed before. Geometry parsers must take this behavior into account! 
   
   - Address some compiler warnings.
     - Mainly add override/final statements in header files.
   - Implement a module to invoke python as a DD4hep plugin:
     invoked e.g. by: `geoPluginRun -plugin DD4hep_Python -dd4hep -prompt`
     ```
     geoPluginRun -plugin DD4hep_Python -help
     Usage: -plugin <name> -arg [-arg]                                                  
        name:   factory name     DD4hep_Python                                        
        -import  <string>        import a python module, making its classes available.
        -macro   <string>        load a python script as if it were a macro.          
        -exec    <string>        execute a python statement (e.g. import ROOT.    
        -eval    <string>        evaluate a python expression (e.g. 1+1)          
        -prompt                  enter an interactive python session (exit with ^D)   
        -dd4hep                  Equivalent to -exec "import dd4hep"                
        -help                    Show this online help message.                       
   
        Note: entries can be given multiple times and are executed in exactly the     
              order specified at the command line!                      
     ```
     Implementation wise the plugin is a simple CLI wrapper for TPython.
 
 * 2018-04-12 Marko Petric ([PR#362](https://github.com/aidasoft/dd4hep/pull/362))
   - Update DD4hepManual
 
 * 2018-04-12 Markus Frank ([PR#360](https://github.com/aidasoft/dd4hep/pull/360))
   - Examples: only build some examples depending on the availability of dependencies.
   - DDCore: Add interface to allow URI blocking during file parsing. Default is as now.
   - DDCMS: Add conversion of new shapes.
 
 * 2018-04-10 Markus Frank ([PR#359](https://github.com/aidasoft/dd4hep/pull/359))
   - Bunch of fixes. Mostly in `examples/DDDB`
   - Only build `examples/DDDB` if XercesC is present.
   - Only build `examples/DDCMS` if CLHEP is present
 
 * 2018-04-09 Markus Frank ([PR#357](https://github.com/aidasoft/dd4hep/pull/357))
   - Add configuration options for loading DDDB
 
 * 2018-04-05 Markus Frank ([PR#351](https://github.com/aidasoft/dd4hep/pull/351))
   - To avoid unwanted disappearing conditions sub pools, a conditions slice may be instructed to collect shared references to the used pools in the slice.
   - For python:
     - Move DDG4/SystemOfUnits.py to DDG4/g4units.py
       Keep SystemOfUnits.py with deprecation warning
     - move DD4hep.py to dd4hep.py. 
       import dd4hep also imports all TGeoUnit units into its namespace.
       Hence: import dd4hep; print dd4hep.m  gives: "100.0"
     - DD4hep.py is kept for backwards compatibility issuing a deprecation warning
     - DDG4.py: imports g4units    as G4Units:         DDG4.G4Units.m etc.
     - DDG4.py: imports TGeoUnit as TGeo4Units:  DDG4.TGeoUnits.m etc.
     - Some problem with replacing DD4hepUnits.h with TGeoSystemOfUnits.h
       Surface test complains. To be investigated. Keep old DD4hepUnits for the time being.
 
 * 2018-04-05 Markus Frank ([PR#350](https://github.com/aidasoft/dd4hep/pull/350))
   - Merge `DDCMS` and `DDCMSTests` to `DDCMS`
   - Move `DDDB` to the `examples/`
   - Add tests `DDDB_DeVelo` and `DDDB_DeVelo_Gaudi` missing from #349
 
 * 2018-04-05 Markus Frank ([PR#349](https://github.com/aidasoft/dd4hep/pull/349))
   - Resolves #339 
   - DDDB conditions had a bug when loading from file base. The IOV was not handled properly. Now the resulting IOV is configurable using properties.
   - Added Gaudi like example use case for options handling with the DeVelo detector elements.
   - Configuration improvement in DDG4 action Output2ROOT:
     - New property "DisableParticles" allows to suppress the MCParticle record from being written to the ROOT file.
     - dto. the option "DisabledCollections" allows to NOT write any hit collection.
     - Unit tests for these options are not (yet) present.
   - DDCond: allow for user defined conditions cleanup policies. Base class `dd4hep::cond::ConditionsCleanup`. Callbacks are issued to the class for IOV type pools and IOV dependent pools asking if the pools should be processed.
 
 * 2018-04-05 Marko Petric ([PR#344](https://github.com/aidasoft/dd4hep/pull/344))
   - Move `DDCMS` into examples as it is not core functionality
 
 # v01-07-02
 
 * 2018-06-26 Frank Gaede [PR#413](https://github.com/AIDASoft/DD4hep/pull/413)
   - bug fix in Geant4EventReaderGuineaPig
     - fix ignoring input lines with 'nan'
     - did not work on SL6 w/ gcc
 
 
 # v01-07-01
 
 * 2018-05-17 Frank Gaede
    - fix bug in input handling, for details see discussion [#387](https://github.com/AIDASoft/DD4hep/issues/387)
      - exclude leptons with zero lifetime from Geant4
 
 # v01-07
 
 * 2018-03-26 Javier Cervantes Villanueva ([PR#343](https://github.com/AIDASoft/DD4hep/pull/343))
   - Fix bug in calculating eta, introduced in #138 
     - use `magFromXYZ` instead of `radiusFromXYZ` to calculate pseudorapidity
 
 * 2018-03-19 Frank Gaede ([PR#338](https://github.com/AIDASoft/DD4hep/pull/338))
   - Include fixes from Chris Burr for the alignments calculator.
    - Add a small study for the LHCb upgrade defining reasonable detector element conditions for the Velo pixel detector using the DDCond derived condition mechanism.
    - To be done: somehow get an example for this mechanism, which works outside Gaudi.
 
 * 2018-03-23 Markus Frank ([PR#340](https://github.com/AIDASoft/DD4hep/pull/340))
   - Improvement for DDDB - case study to implement real-world detector elements.
 
 * 2018-03-28 Frank Gaede ([PR#345](https://github.com/AIDASoft/DD4hep/pull/345))
   - Remove `DDSurfaces` folder as it was merged in `DDRec`
 
 * 2018-03-28 Frank Gaede ([PR#341](https://github.com/AIDASoft/DD4hep/pull/341))
   - Remove top level `DDSegmentation` folder as it is not needed anymore
 
 # v01-06
 
 * 2018-01-31 Ete Remi ([PR#297](https://github.com/aidasoft/dd4hep/pull/297))
   - Geant4Output2LCIO
      - Switch run header writing order at beginning of run instead of end of run
 
 * 2018-03-15 Marko Petric ([PR#335](https://github.com/aidasoft/dd4hep/pull/335))
   - Deduce CLHEP location from `CLHEP_INCLUDE_DIR` ( Fixes #314 )
   - Add `gSystem.Load('libglapi')` to `testDDPython.py` which failed due to TLS issues on local machine
   - Add Geant4 10.4 to test suite
 
 * 2018-03-14 Markus Frank ([PR#336](https://github.com/aidasoft/dd4hep/pull/336))
   - New shape definitions for CMS
     Generic Polyhedra, ExtrudedPolygon, CutTube, TruncatedTube, PseudoTrap.
   - DDDB: allow to configure the match for the entity resolver.
 
 * 2018-03-13 Daniel Jeans ([PR#333](https://github.com/aidasoft/dd4hep/pull/333))
   - changed utility name from graphicalMaterialScan -> graphicalScan
   - add visualisation of electric and magnetic fields (switched by parameter)
   - change order of x/y/z range parameters for ease of use
   - added parameter for name of output root file
 
 * 2018-03-12 Markus Frank ([PR#334](https://github.com/aidasoft/dd4hep/pull/334))
   - `step_length_max` not propagated to Geant4 for `G4UserLimit` instances.
    - All limits can now be set separately for each particle type (or for all as a catchall situation if the particle type is '*'.
    - Fixes #327
 
 * 2017-11-29 Markus Frank ([PR#271](https://github.com/aidasoft/dd4hep/pull/271))
   - Add `LHeD` example (contribution from Peter Kostka)
   - Fix to support `python3` in `DDG4`
   - Fix issue in Volumes.h for backwards compatibility with gcc version < 5
   - Fix type definition of `XmlChar` to also support Xerces-C 3.2.0
   - Fix `AClick` initialization files in `DDG4` (remove dependency on `libDDSegmentation`)
 
 * 2017-11-29 Marko Petric ([PR#270](https://github.com/aidasoft/dd4hep/pull/270))
   - Fields: Remove pessimizing move and shadow warnings
 
 * 2018-02-06 Ete Remi ([PR#301](https://github.com/aidasoft/dd4hep/pull/301))
   - Geant4Output2LCIO plugin
      - Added run number and event number offset properties. Enable steering of run and event counters from outside
      - Added 3 event parameters properties for int, float and string event parameters
 
 * 2018-02-05 Markus Frank ([PR#304](https://github.com/aidasoft/dd4hep/pull/304))
   - Restructure the files a bit to simplify the use of the `XML` and `JSON` parsers and the spirit utilities in other projects.
 
 * 2018-02-28 Frank Gaede ([PR#323](https://github.com/aidasoft/dd4hep/pull/323))
   - make Geant4InputHandling.cpp compatible w/ gcc49 
        - avoid stringstream move operation
        - fixes #320
 
 * 2018-01-24 Markus Frank ([PR#292](https://github.com/aidasoft/dd4hep/pull/292))
   -  Fix bug in Alignment test:
      - A long standing bug was fixed for the test `t_AlignDet_Telescope_align_new`.
      - It was assumed that the `DetElements` were ordered in memory, which is **not** true (probably due to memory randomization).
      - Moved to path dependent ordering. Test now OK.
      - Closes #282 
   
   -  Removed a Bunch of `rootcling` warnings
      - Apparently `rootcling` now expects a class with the name of the dictionary header file.
      - To satify this some dummy anonymous classes were added.
      - Closes #290
 
 * 2018-01-26 Marko Petric ([PR#296](https://github.com/aidasoft/dd4hep/pull/296))
   -  Check dynamic cast if it was successful
 
 * 2018-01-22 Markus Frank ([PR#289](https://github.com/aidasoft/dd4hep/pull/289))
   - Add possibility to parse `XML` from string
     - Please see  #288 for details.
     - The main interface was not changed. Rather a view to the Detector class supports this functionality.
      - The existing view `dd4hep::DetectorLoad` was enhanced to allow the required functionality:
      ```cpp
       Detector detector = ....;
       /// So here is the actual test: We parse the raw XML string
       DetectorLoad loader(detector);
       loader.processXMLString(buffer,0);
      ```
      - An example was added (`ClientTests/src/XML_InMemory.cpp`, which illustrates the usage).
   
   - Improve DDCond manual
     - Improve that the DDCond manual reflects the source code.
     - The possible plugins provided are not all described. This shall be future work.
   
   - Enable the GDML reader plugin
     - Closes #275
 
 * 2018-03-01 Markus Frank ([PR#325](https://github.com/aidasoft/dd4hep/pull/325))
   - Add dictionaries to `DDRec`. 
     - Consequently add the python interface to access the exported classes.
 
 * 2018-03-01 Ete Remi ([PR#321](https://github.com/aidasoft/dd4hep/pull/321))
   - Geant4InputAction and Geant4EventReader : 
       - Register input action pointer to event reader, enabling the event reader to access the Geant4 context
   - Added new class LCIOEventParameters to handle LCIO input event parameters
   - LCIOFileReader : 
       - Add extension with LCIO input event parameters to Geant4event
   - Geant4Output2LCIO : 
       - Get LCIO event parameters from event extension (if any) and write them to LCIO output event
 
 * 2018-03-01 David Blyth ([PR#317](https://github.com/aidasoft/dd4hep/pull/317))
   - DDCore: added CartesianStrip segmentations
 
 * 2018-03-02 Frank Gaede ([PR#328](https://github.com/aidasoft/dd4hep/pull/328))
   - finalize the python bindings for DDRec:
       - implement StructExtension(DetElement&) and toString() 
       - add DetectorData classes to python 
       - add example `dumpDetectorData.py`
       - closes #306 
   - remove deprecated methods and classes in DDRec
       - resolves #326
 
 * 2018-03-06 Andre Sailer ([PR#331](https://github.com/aidasoft/dd4hep/pull/331))
   - Geant4InputHandling: reject stable particles without lifetime (e.g., initial state electrons), fixes #330
 
 * 2018-03-07 Markus Frank ([PR#329](https://github.com/aidasoft/dd4hep/pull/329))
   - Fixes #324
   - Call `TGeoMixture::ComputeDerivedQuantities()` for ROOT >= 6.12.0 (Resolves #281)
   - Start to address issue: https://github.com/AIDASoft/DD4hep/issues/327
 
 * 2018-03-07 Daniel Jeans ([PR#322](https://github.com/aidasoft/dd4hep/pull/322))
   - correct coded expressions for quadrupole, sextupole and octopole fields.
   - correct expression for octopole field in documentation
 
 * 2018-03-09 Ercan Pilicer ([PR#319](https://github.com/aidasoft/dd4hep/pull/319))
   - Remove unnecessary `import exceptions` from python
 
 * 2017-11-30 Markus Frank ([PR#272](https://github.com/aidasoft/dd4hep/pull/272))
   ### DDG4 enhancements
   - Enable framework support in DDG4. The `Geant4Context` is the main thread specific accessor to the `dd4hep`, `DDG4` and the user framework.
       - The access to the `dd4hep` objects is via the `Geant4Context::detectorDescription()` call,
       - the access to `DDG4` as a whole is supported via `Geant4Context::kernel()` and
       - the access to the user gframework using a specialized implementation of:
       `template <typename T> T& userFramework()  const;`
    
       A user defined implementations must be specialized somewhere in a compilation unit of the user framework, not in a header file. The framework object could host e.g. references for histogramming, logging, data access etc.
     
       This way any experiment/user related data processing framework can exhibit its essential tools to `DDG4` actions.
     
       A possible specialized implementations would look like the following:
     ```cpp
       struct Gaudi  {
         IMessageSvc*   msg;
         IHistogramSvc* histos;
         ....
       };
       template<> Gaudi& Geant4Context::userFramework<Gaudi>()  const  {
         UserFramework& fw = m_kernel->userFramework();
         if ( fw.first && &typeid(T) == fw.second ) return *(T*)fw.first;
         throw std::runtime_error("No user specified framework context present!");
       }
     ```  
       To access the user framework then use the following call:
       ```cpp
       Gaudi* fw = context->userFramework<Gaudi>();
       ```
       of course after having initialized it:
     ```cpp
       Gaudi * fw = ...;
       GaudiKernel& kernel = ...;
       kernel.setUserFramework(fw);
     ```
   
   - `G4RunManager` is now a plugin. To enable user defined run managers in `DDG4`, the run manager is encapsulated in a `Geant4Action`. See `DDG4/plugins/Geant4RunManagers.cpp` how to implement such plugins. Currently there are to factories implemented: 
      -  `G4RunManager` -> factory invokes the single threaded `G4RunManager`
      -  `G4MTRunManager `-> factory invokes the multi threaded `G4MTRunManager`
   
     The factory names here are identical to the names of the native G4 classes.
 
 * 2017-11-30 Marko Petric ([PR#268](https://github.com/aidasoft/dd4hep/pull/268))
   - Introduce new DD4hep web-site: http://dd4hep.cern.ch/
     - Page is automatically build from [this repo](https://gitlab.cern.ch/CLICdp/DetectorSoftware/DD4hep-website)
   - Restructured `doc` folder and removed not doc related stuff to `etc` 
   - Fixes to Doxygen configuration
     - create reference manual `make reference`
   - Better integration of DD4hep tex documentation and cmake
     - create manuals in PDF format `make pdf` create manuals in HTML format `make html`
     - allow creation of documentation if dependencies are not present
   - extended gitlab runners to automatically build documentation PDF and HTML and also reference manual and publish to web-site, thus ensuring always up to date information.
 
 * 2018-02-14 Markus Frank ([PR#310](https://github.com/aidasoft/dd4hep/pull/310))
   - Fix MC truth problem in DDG4
   - Update of the `XML` reader to simplify externalization
 
 * 2018-02-15 David Blyth ([PR#302](https://github.com/aidasoft/dd4hep/pull/302))
   - Added "NOINSTALL" option to cmake build function dd4hep_add_library
 
 * 2018-02-16 Andre Sailer ([PR#315](https://github.com/aidasoft/dd4hep/pull/315))
   - DDG4::ExtraParticles: particles with too small life time were tagged as stable, now correctly marked unstable
   - DDG4::Geant4InputHandling: pass all particles except strings, quarks and gluons to Geant4 to get completely consistent MCParticle History, fixes #307 
   - DDG4::Geant4PrimaryHandler: add property RejectPDGs
   - DDG4::Geant4InputHandling: print geant4 primary particle chains if VERBOSE
 
 * 2017-11-16 David Blyth ([PR#258](https://github.com/aidasoft/dd4hep/pull/258))
   - Corrected `EcalBarrel` constructor after finding significant layer overlaps
   - Corrected `CylindricalEndcapCalorimeter` factors of 2 in layer/slice thickness
   - Corrected `ForwardDetector` factors of 2 in layer/slice thickness
 
 * 2017-12-05 Marko Petric ([PR#278](https://github.com/aidasoft/dd4hep/pull/278))
   - Remove `DD4HEP_USE_CXX11` and `DD4HEP_USE_CXX14` and use [CMake default way](https://cmake.org/cmake/help/v3.1/variable/CMAKE_CXX_STANDARD.html)`CMAKE_CXX_STANDARD` to define C++ standard
 
 * 2017-12-05 Marko Petric ([PR#277](https://github.com/aidasoft/dd4hep/pull/277))
   - Fix logic for ignoring warnings in dictionary creation
   - Add `-Wno-overlength-strings` to all generated targets
 
 * 2017-12-05 peterkostka ([PR#276](https://github.com/aidasoft/dd4hep/pull/276))
   - Update of LHeD example - overlaps (problem with SubdetectorAssembly)
 
 * 2017-12-01 Markus Frank ([PR#275](https://github.com/aidasoft/dd4hep/pull/275))
   - Add Support to Export and Import GDML Data
     - Allow extorts and imports of partial geometry trees with GDML. **This requires however a future version of ROOT**, since some changes were necessary in the ROOT GDML handlers. The code is commented out for the time being. The plugin implementation is in `DDCore/src/gdml/GdmlPlugin.cpp`
   - Remove print statements from DDG4 scripts
      - Replace prints with calls to the python logging utility. Hopefully this shall give at some point python3 compatibility.
   - Update `G4Stepper` factories
     - Add some missing steppers
 
 * 2017-12-01 Marko Petric ([PR#274](https://github.com/aidasoft/dd4hep/pull/274))
   - Revert `DDG4.py` Geant4 initialization parameters back to values specified in Geant4 (see discussion #266)
 
 # v01-05
 
 * 2017-11-10 Dan Protopopescu ([PR#262](https://github.com/aidaSoft/DD4hep/pull/262))
   - Added createGearForSiD minimal plugin solely for use with LCCalibration
 
 * 2017-11-10 Frank Gaede ([PR#261](https://github.com/aidaSoft/DD4hep/pull/261))
   - add `Geant4::HitData::MonteCarloContrib::length`  (step length) 
   - set in all CalorimeterSDActions
   - write out it LCIO if `Geant4Sensitive::DETAILED_MODE` and LCIO_VERS>v02-10
 
 * 2017-11-10 Whitney Armstrong ([PR#260](https://github.com/aidaSoft/DD4hep/pull/260))
   - added electric and magnetic field functions that return the field value (taking the position as the only argument) directly in `dd4hep::OverlayedField`
 
 # v01-04
 
 * 2017-10-17 Markus Frank ([PR#248](https://github.com/aidasoft/DD4hep/pull/248))
   ### VolumeManager Implementation
   A possibly important bug was fixed for the lookup of top level subdetectors in the `VolumeManager` by volume identifers of (sensitive) volumes. Due to a bug in the de-masking possible wrong top level subdetectors were returned. The default use cases typically do not use this call and hence should not be affected.
 
 * 2017-10-17 Shaojun Lu ([PR#247](https://github.com/aidasoft/DD4hep/pull/247))
   - Fix C++11 pointer error by adding include <memory> for 'unique_ptr' (GCC 4.9).
 
 * 2017-10-13 Marko Petric ([PR#246](https://github.com/aidasoft/DD4hep/pull/246))
   ### DDCMS:
   - Improve the CMS excercise. New examples etc.
   - Support for simulation using DDG4 (at least partially - since not all subdetector volumes are accepted by Geant4).
   
   ### DDG4:
   - Event reader returns `EVENT_READER_EOF` if `EOF` is detected rather than a generic IO error.
   - Add generator status word to the `Geant4Particle` object. Remove the extension mechanism, which is very heavy to just add one integer.
   
   ### General:
    - We need to distinguish the plugins using some namespace mechanism. I started to introduce the namespace separator `"_".` Hence all DD4hep plugins start with `DD4hep_<plugin>`. I hope this does not break everything. If it does, please notify me and we can undo.
 
 * 2017-10-13 Whitney Armstrong ([PR#243](https://github.com/aidasoft/DD4hep/pull/243))
   - Added helper function `getAttrOrDefault` (defined in  `DDCore/include/XML/Helper.h`) 
    This  function `getAttrOrDefault(xml::Element e, xml::XmlChar attr_name, T default_value)` will return the attribute  name,  converted to to type `T` but if it is not found it will return `default_value`. When building new detectors supplying this is useful for supplying default attribute values.
 
 * 2017-10-19 Markus Frank ([PR#249](https://github.com/aidasoft/DD4hep/pull/249))
   * Improve the CMS tracker visualisation
   * Add DDG4 simulation example to DDCMS
   * Add some plugins to add visualisation attributes if required (not for the compact description)
 
 * 2017-11-01 David Blyth ([PR#254](https://github.com/aidasoft/DD4hep/pull/254))
   - DDG4/python/DDG4.py: loadDDG4() changed to not raise exception if libraries are already loaded
 
 * 2017-11-01 David Blyth ([PR#252](https://github.com/aidasoft/DD4hep/pull/252))
   - Added requirement of Python 2 in cmake/FindPYTHON.cmake.  This makes clear the requirement of Python 2, and resolves the issue where CMake tries to build with Python 3 in a system where both exist.
 
 * 2017-11-07 Frank Gaede ([PR#256](https://github.com/aidasoft/DD4hep/pull/256))
   - bug fix in `BitField64::operator[std::string]() `
   - make uses of TString in DocumentHandler.cpp compatible with clang9 (on Mac)
 
 # v01-03
 
 * 2017-10-12 Frank Gaede ([PR#244](https://github.com/AIDASoft/DD4hep/pull/244))
   - allow for unbounded surfaces in DDRec
        - add new property `SurfaceType::Unbounded`
        - if a surface is marked unbounded `Surface::insideBounds()` ignores the volume boundaries (and only checks the distance to the surface)
 
 * 2017-09-19 Whitney Armstrong ([PR#233](https://github.com/AIDASoft/DD4hep/pull/233))
   - Added helper  `CellIDPositionConverter::cellDimensions(const CellID& cell)`
 
 * 2017-10-09 Frank Gaede ([PR#242](https://github.com/AIDASoft/DD4hep/pull/242))
   - improve `BitFieldCoder` class
       - remove heap allocation of BitFieldElements
       - add move constructors for efficient filling of vector
 
 * 2017-09-29 Frank Gaede ([PR#238](https://github.com/AIDASoft/DD4hep/pull/238))
   - add new threadsafe class `BitFieldCoder` as replacement for `BitField64`
   - use as `const` everywhere
   - re-implement `BitField64` using `BitFieldCoder`
     - is thread safe if used locally 
     - can be instantiated from `const BitFieldCoder*`
 
 * 2017-09-18 Markus Frank ([PR#234](https://github.com/AIDASoft/DD4hep/pull/234))
   - Created a new example showing the CMS tracking detector
     - Get CMS going with their evaluation. Added a package DDCMS with the conversion plugins for the silicon trackers and the corresponding conversion mechanism for their `xml` structure.
 
 * 2017-09-18 Frank Gaede ([PR#232](https://github.com/AIDASoft/DD4hep/pull/232))
   - fix reading of stdhep/lcio generator files with generator statuses not in [0,3]
   - add `G4PARTICLE_GEN_BEAM` and `G4PARTICLE_GEN_OTHER` to DDG4
     -  `G4PARTICLE_GEN_BEAM`  is generally agreed to be used for beam particles (HepMC, LCIO)
     -  all other status codes vary from generator to generator and we use OTHER
   - for stdhep or lcio input the true generator status is preserved in the lcio output, regardless of its value
   - create a vertex for every parent-less particle in LCIOEventReader
     - this allows for example to read GuineaPig files ( non-prompt pair particles) or special user created files with non-prompt particles
    - Resolves #101
 
 * 2017-09-20 Markus Frank ([PR#235](https://github.com/AIDASoft/DD4hep/pull/235))
   - A more complete version of the CMS tracker
      - Enhanced the CMS tracker example to be more complete.
      - Stopped at some point to convert all CMS algorithms. Hence, the tracker is not complete, but the remaining work looks to be purely mechanical.
 
 * 2017-10-02 Frank Gaede ([PR#239](https://github.com/AIDASoft/DD4hep/pull/239))
   - add cell sizes to printout of `LayeredCalorimeterData::layer`
       - used in `dumpdetector -d`
 
 * 2017-09-14 Frank Gaede ([PR#231](https://github.com/AIDASoft/DD4hep/pull/231))
   - adapt LCIOEventReader for Pythia8 and Whizard2
     - add all parent-less particles to outgoing vertex
     - fixes #226 and closes #229 
     - also used for stdhep files
 
 * 2017-09-07 Daniel Jeans ([PR#227](https://github.com/AIDASoft/DD4hep/pull/227))
   - Fix calculation of cell position in `MegatileLayerGridXY`
   - previously, returned position was the lower corner of the cell
   - after this bug fix, it's the cell centre
 
 * 2017-10-05 Frank Gaede ([PR#241](https://github.com/AIDASoft/DD4hep/pull/241))
   - remove deprecated and unused classes from DDRec
 
 * 2017-10-05 Frank Gaede ([PR#240](https://github.com/AIDASoft/DD4hep/pull/240))
   - add `dd4hep::rec::FixedPadSizeTPCData.zMinReadout`
        - needed to describe the cathode thickness
 
 * 2017-08-21 Markus Frank ([PR#221](https://github.com/AIDASoft/DD4hep/pull/221))
   - Document several classes in doxygen notation.
      - Aim is that there are (at least) no class headers without docs.
      - See [documentation](http://test-dd4hep.web.cern.ch/test-dd4hep/doxygen/html/annotated.html)
 
 # v01-02                                                                                                                                                                        
 
 * 2017-07-14 Daniel Jeans ([PR#204](https://github.com/AIDAsoft/DD4hep/pull/204))
   - add ncellsX/Y as a "parameter", allowing it to be set in compact description. This change is for easier use in the case of a MultiSegmentation. (Only a uniform segmentation can be defined in this way: for more complex cases, must set by driver.)                                                                                                                                                                                                                                 
   - change from array to std::vector to store ncells information                                                                                                                                                                             
 
 * 2017-07-17 Markus Frank ([PR#206](https://github.com/AIDAsoft/DD4hep/pull/206))
   ## Implement ROOT persistency mechanism for detector descriptions (continuation of AIDASoft/DD4hep#202).
   Object extensions are now persistent.                                                                   
                                                                                                           
   This is however not for free: **it requires a dictionary for the extension itself and it requires a dictionary for the class holding the extension**. These are:
    - `dd4hep::DetElement::DetElementExtension<IFACE,CONCRETE>` for `DetElement` extensions.                                                                       
    - `dd4hep::SimpleExtension<IFACE,CONCRETE>` for simple extension managed by the user framework (user calls explicitly destructor).                             
    - `dd4hep::DeleteExtension<IFACE,CONCRETE>` for simple extension managed by dd4hep (dd4hep calls automatically destructor on hosting object destruction).      
    - `dd4hep::CopyDeleteExtension<IFACE,CONCRETE>`. As above, but these extensions support calling the copy constructor of the embedded object and hence allow to copy also the hosting objects.
                                                                                                                                                                                                 
   Please note: to persistify these objects it was necessary to no longer use the type-info of the objects as an identifier, but rather a 64-bit-hash of the raw type-info-name. This relies that this name is identical across platforms. This typically is true for linux, but not enforced by any standard.                                                                                                                                                                             
 
 * 2017-08-11 Andre Sailer ([PR#213](https://github.com/AIDAsoft/DD4hep/pull/213))
   - CMake:: dd4hep_generate_rootmap: use CMAKE_INSTALL_LIBDIR if it is set. If the macro is called from other libraries this variable might be set and should be used for consistency. Fixes #212
 
 * 2017-07-13 Markus Frank ([PR#202](https://github.com/AIDAsoft/DD4hep/pull/202))
   ## Implement ROOT persistency mechanism for detector descriptions              
                                                                                  
   The following commits allow to save and restore Detector objects (ie. the full detector description) to/from ROOT. Most changes affected the usage of void pointers. 
                                                                                                                                                                        
   It is **NOT** possible to:                                                                                                                                           
    * save object extensions. Another usage of void pointers and type-info objects, which both cannot be saved.                                                         
    * save callback objects. Callbacks store in memory pointers to member functions. These depend on the loading of libraries at run-time and hence may differ from application to application.
    * save conditions slices. This shall be a futute extension. There should be no fundamental problem doing so - it was simply not yet done.                                                  
                                                                                                                                                                                               
   In the example area a new slot call "Persistency" was created with various tests:                                                                                                           
    * Save and restore simple conditions                                                                                                                                                       
    * Save and restore the MiniTel detector (`examples/ClientTests/compact/MiniTel.xml`)                                                                                                       
    * Save and restore the CLICSiD detector (`examples/CLICSiD/compact/compact.xml`)                                                                                                           
                                                                                                                                                                                               
   The detector examples also have a set of tests associated to check the validity of the restored information.                                                                                
                                                                                                                                                                                               
   ## Integrate `DDSegmentatation` into `DDCore`                                                                                                                                               
                                                                                                                                                                                               
   As a first step to start the cleanup of `DDSegmentation` the code was integrated into `DDCore`. For backwards compatibility a dummy library `libDDSegmentation.so` is kept, so that client cmake files directly referring `DDSegmentation` still work. **This tough is only a temporary measure and users should remove references to the DDSegmentation library.** Include files can be accessed as before. These are part of the `DDCore` include directory.                          
 
 * 2017-08-15 Yorgos Voutsinas ([PR#216](https://github.com/AIDAsoft/DD4hep/pull/216))
   * Adding variable "nocore" for beam pipe (with default value = false) In case the variable appears in the BP xml file as "true", the BP sections will have no core of beam material, in order that someone might add various BP walls made of different materials while avoiding G4 overlaps. Example of use:                                                                                                                                                                           
   ```xml                                                                                                                                                                                                                                     
   <detector name="BeBeampipe" type="DD4hep_Beampipe_o1_v01" insideTrackingVolume="true" nocore="true" vis="BeamPipeVis">                                                                                                                     
   ```                                                                                                                                                                                                                                        
 
 * 2017-08-15 Jan Strube ([PR#215](https://github.com/AIDAsoft/DD4hep/pull/215))
   - LCIOEventReader: adding parameter for the name of the MCParticle collection: `MCParticleCollectionName`
 
 * 2017-08-14 Markus Frank ([PR#217](https://github.com/AIDAsoft/DD4hep/pull/217))
   ## Enhance ROOT Detector Description Persistency                               
   Conditions slices from the DD4hep conditions store can now be saved to ROOT files ans named objects. Conditions persistency examples are added to the `examples/Conditions` section.
   The examples are derived from the Telescope and CLICSiD example:                                                                                                                    
    - `Conditions_Telescope_root_save`                                                                                                                                                 
    - `Conditions_Telescope_root_load_iov`                                                                                                                                             
    - `Conditions_Telescope_root_load_pool`                                                                                                                                            
    - `Conditions_CLICSiD_root_save_LONGTEST`                                                                                                                                          
    - `Conditions_CLICSiD_root_load_iov_LONGTEST`                                                                                                                                      
    - `Conditions_CLICSiD_root_load_usr_LONGTEST`                                                                                                                                      
    - `Conditions_CLICSiD_root_load_cond_LONGTEST`                                                                                                                                     
                                                                                                                                                                                       
   ## Fix Handle Problem when Accessing Materials from Volumes                                                                                                                         
   A cast problem was not spotted in the last commit, which manifested itself in accessing invalid materials from volumes. This commit resolves #211 , reported by @jhrdinka.          
                                                                                                                                                                                       
   A set of tests checks this behaviour in the ClientTests: `ClientTests_volume_materials_<text>`, where the volume tree is scanned and for all sensitive volumes and access the corresponding `materials/TGeoMedium` entities from the volume object.                                                                                                                                                                                                                                     
 
 * 2017-07-18 Shaojun Lu ([PR#208](https://github.com/AIDAsoft/DD4hep/pull/208))
   - added "#include <memory>" for the smart pointers to DD4hepRootPersistency.cpp
 
 * 2017-07-19 Markus Frank ([PR#209](https://github.com/AIDAsoft/DD4hep/pull/209))
   - Implement `dd4hep::Tube` using `TGeoTubeSeg` (See also Issue AIDASoft/DD4hep#203 for details)
 
 * 2017-07-21 Markus Frank ([PR#210](https://github.com/AIDAsoft/DD4hep/pull/210))
   ## Implement ROOT persistency mechanism for the conditions                     
                                                                                  
   Conditions pools can now be made persistent provided all the dictionaries for the payload objects are provided. A new class `ConditionsRootPersistency` allows to save and re-load conditions pools to/from a ROOT file. Such pools can either be:                                                                                                                                                                                                                                      
    - Simple `ConditionsPool` objects                                                                                                                                                                                                         
    - The entire `IOV` indexed pool set (class `ConditionsIOVPool`) or                                                                                                                                                                        
    - A the pool used by a `ConditionsSlice` (class `UserPool`).
    - A std::vector<Condition> which belong all to the same IOV
 
   In any case the restoration of the saved conditions is performed through the `ConditionsManager` interface in order to ensure proper management of the added condition objects.
 
   Some example plugin tasks were added in examples/Conditions:
    - `DD4hep_ConditionExample_save` to save conditions to a ROOT file.
    - `DD4hep_ConditionExample_load` to restore conditions from file.
 
   Others to come.
 
   ## Split of dictionary files
   The ROOT dictionary creation in `DDCore` was getting increasingly large. Now the ROOT dictionaries are created in several files, what firstly allows them to be produced in parallel and secondly eases the compilation due to smaller generated file sizes.
 
 
 # v01-01
 
 * 2017-07-06 Markus Frank ([PR#201](https://github.com/AIDASoft/DD4hep/pull/201))
   ## DDCore: Changes to the VolumeManager interface
   
     Recent descrepancies showed that the call to lookup a placement
     from the volume manager may have an ambiguous meaning:
     It may (as used until now) be the placement of thge closest
     detector element - a functionality used by various tests
     or be the placement of the sensitive volume itself.
     So far, since each sensitive volume in the DD4hep tests
     is represented by a DetElement structure, both
     approaches returned the same placed volume.
   
     Since there is the possibility to have sensitive volumes, which are not
     directly connected to a single DetElement structure, this call was
     split to resolve this ambiguity:
   
     /// Lookup a physical (placed) volume identified by its 64 bit hit ID
     PlacedVolume lookupVolumePlacement(VolumeID volume_id) const;
     /// Lookup a physical (placed) volume of the detector element
     /// containing a volume identified by its 64 bit hit ID
     PlacedVolume lookupDetElementPlacement(VolumeID volume_id) const;
 
 * 2017-07-06 Andre Sailer ([PR#200](https://github.com/AIDASoft/DD4hep/pull/200))
   - Now will give a warning if multiple entities (e.g., constants) of the same name are defined in the XML
 
 # v01-00-01
 
 * 2017-07-04 Frank Gaede ([PR#199](https://github.com/AIDASoft/DD4hep/pull/199))
   - bug fix for VolumeManagerContext::toElement() and VolumeManagerContext::placement() 
         - set flag=true in VolumeManager_Populator::add_entry when 
            a ContextExtension is needed, i.e. sensitive volume is not DetElement's volume
   - fixes problems in CellIDPositionConverter
 
 # v01-00
 
 * 2017-06-22 Marko Petric ([PR#192](https://github.com/AIDASoft/DD4hep/pull/192))
   - Move `AlignDet_Telescope_readback_xml` to later in the pipeline since it depends on the output of `AlignDet_Telescope_write_xml`
 
 * 2017-06-22 Andre Sailer ([PR#191](https://github.com/AIDASoft/DD4hep/pull/191))
   - Surface: fix memory leak of transformation matrix
   - XML::Layering: fix memory leak of contained layers in the object
 
 * 2017-06-23 Andre Sailer ([PR#197](https://github.com/AIDASoft/DD4hep/pull/197))
   - Fix memory leaks for Tube, EllipticalTube and Polyhedron
 
 * 2017-06-23 Andre Sailer ([PR#196](https://github.com/AIDASoft/DD4hep/pull/196))
   - CMake: add `Project( DD4hep )`, needed to get the correct CMAKE_CXX_COMPILER_ID on macs due to CMP0025 (cmake policy)
   - CMake: fix treatment of linker flags, they are now properly set for Linux and Macs to error when undefined functions are encountered at link time
   - CMake: fix elif --> elseif when checking threading libraries
 
 * 2017-06-23 Frank Gaede ([PR#195](https://github.com/AIDASoft/DD4hep/pull/195))
   - fix crash in `dd4hep::rec::Surface` after changes in Handle assignment (PR #193)
   - fix use of deprecated `dd4hep::rec::MaterialManager` c'tor in Surface
 
 * 2017-06-20 Frank Gaede ([PR#185](https://github.com/AIDASoft/DD4hep/pull/185))
   - bug fix in material utilities
        - call `MaterialManager( Volume v)` with `Detector.world().volume()`
 
 * 2017-06-20 Marko Petric ([PR#184](https://github.com/AIDASoft/DD4hep/pull/184))
   - Reinstate the full test-suite on Travis
 
 * 2017-06-20 Markus Frank ([PR#183](https://github.com/AIDASoft/DD4hep/pull/183))
   - Unify header guards in DDCore
   - Add header to steer ignoring warnings of rootcling generated dictionaries.
 
 * 2017-06-20 Frank Gaede ([PR#182](https://github.com/AIDASoft/DD4hep/pull/182))
   - cleanup of namespace `dd4hep::rec`
     - remove obsolete bwd compatibility for `DD4hep::DDRec`
     - re-introduce `[deprecated]` warnings for unmaintained classes in DDRec/API 
     - re-fix deprecated c'tor for `MaterialManager` in material utilities
 
 * 2017-06-20 Markus Frank ([PR#181](https://github.com/AIDASoft/DD4hep/pull/181))
   - Attack many warnings from:
     - `-Wshadow`
     - `-Winclude-hygiene`
     - `-Woverlength-strings` (int cling dictionaries)
 
 * 2017-06-20 Markus Frank ([PR#179](https://github.com/AIDASoft/DD4hep/pull/179))
   - Remove a bunch of shadow warnings and include-hygiene warnings.
 
 * 2017-06-21 Marko Petric ([PR#169](https://github.com/AIDASoft/DD4hep/pull/169))
   - Make boost explicit requirement for DD4hep and drop DD4HEP_USE_BOOST
 
 * 2017-06-21 David Blyth ([PR#168](https://github.com/AIDASoft/DD4hep/pull/168))
   - Added environment helper scripts `thisdd4hep_only.(c)sh` that only set up variables for DD4hep and not for dependencies.
 
 * 2017-06-19 Markus Frank ([PR#178](https://github.com/AIDASoft/DD4hep/pull/178))
   - Update documentation after reorganization of namespaces (put back previous docs).
 
 * 2017-06-19 Markus Frank ([PR#175](https://github.com/AIDASoft/DD4hep/pull/175))
   ## DD4hep namespace reorganization
   
   Re-organize namespaces according to the decisions of the DD4hep developers meeting from 16th June we have decided:
   
   1. all namespaces will be lower case and shorter
       * rename namespace `DD4hep` -> `dd4hep`
       * rename namespace `DD4hep::DDRec` -> `dd4hep::rec`
       * rename namespace `DD4hep::Simulation` -> `dd4hep::sim`
       * rename namespace `XML` -> `xml` and `JSON` -> `json`
       * rename all other namespaces according to this pattern
   2. The namespace `DD4hep::Geometry::` will be incorporated into `dd4hep::`
   3. All utilities will be moved `dd4hep::detail`
   4. `LCDD` will be renamed to `Detector` and current `Detector.h` will be renamed to `DetElement.h`
   8. Examine if `DDSegmentation` can be incorporated into `DDCore` and make it volume aware
       * If this this cannot be achieved in whole place `DDSegmentation` into the right namespace
   
     ## DDParsers
   
     DDParsers are now a separate package. This does not make it yet standalone,
     but it is at the same level as e.g. DDSeqmentation. Any librarian is
     encouraged to externialize it fully.
 
 # v00-24
 
 * 2017-06-08 Markus Frank ([PR#160](https://github.com/AIDASoft/DD4hep/pull/160))
   * Add a new class `AlignmentsNominalMap`, which behaves like a `ConditionsMap` and handles alignment entries. 
   * The `AlignmentsNominalMap` is not a conditions cache per-se. This implementation  behaves like a `conditionsmap`, but it shall not return real conditions to the user, but rather return the default alignment objects (which at the basis are conditions as well) to the user. These alignments are taken from the `DetElement` in question `Alignment DetElement::nominal()`.
   
   * The basic idea is to enable users to write code "as if" there would be conditions present. This is important to ease in the lifetime of the experiment the step from the design phase (where obviously no conditions are taken into account) to a more mature phase, where alignment studies etc. actually are part of the "bread and butter work".
   
   * Added a corresponding example in examples/AlignDet:
   ```
   $>   geoPluginRun -volmgr -destroy -plugin DD4hep_AlignmentExample_nominal \
            -input file:${DD4hep_DIR}/examples/AlignDet/compact/Telescope.xml
   ```
      * Access the DetElement nominal conditions using the `AlignmentNominalMap`.
      Any use of DDCond is inhibited.
        1) We use the generic printer, which during the detector element scan accesses the conditions map.
        2) We use a delta scanner to extract the nominal deltas from the `DetElement`'s nominal alignments
        3) We use a `ConditionsTreeMap` to perform the alignments re-computation.
 
 * 2017-06-08 Markus Frank ([PR#159](https://github.com/AIDASoft/DD4hep/pull/159))
   # Implementation of the decisions made at the Conditions mini-workshop
   
   ## Access mechanisms of DD4hep conditions for utilities
   
   Access to conditions is solely supported using the interface class DDCore/ConditionsMap.
   * All utilities must use this interface.
   * Any concrete implementation using conditions/alignment utilities must implement this interface
   * Basic implementation using STL `map`, `multimap` and `unordered_map` are provided.
   * A special no-op implementation of this interface shall be provided to access "default" alignment conditions. This implementation shall fall-back internally to the `DetElement::nominal()` alignment. 
   Known clients: `VolumeManager` (hence: DDG4, DDRec, etc.)
   
   Though this sounds like a trivial change, the consequences concern the entire conditions
   and alignment handling. This interface decouples entirely the core part of DD4hep
   from the conditions cache handling and the alignment handling.
   
   Based on this interface most utilities used to handle conditions, detectors scans
   to visit `DetElement` related condition sets, alignment and conditions printers etc.
   
   For details, please see:
   ```
   DDCore/include/DD4hep/AlignmentsPrinter.h
   DDCore/include/DD4hep/AlignmentsProcessor.h
   DDCore/include/DD4hep/ConditionsPrinter.h
   DDCore/include/DD4hep/ConditionsProcessor.h
   DDCore/include/DD4hep/DetectorProcessor.h
   ```
   
   ## Naming conventions for detector conditions
   
   * Condition are logically attached to DetElements
      * Condition names are: `DetElement.path()+"#"+condition-name`
          Example: `/world/LHCb/DownstreamRegion/Muon/M5/M5ASide/R3ASide/Cham046#alignment`
   
   * Condition keys are a `int64` compound of two `int32`:
   ```cpp
      union {
        int64 key;
        struct {
          int32 item_key;
          int32 det_key;     // Needs to be the high word to have a properly ordered map
        } values;
      };
      det_key  = hash32(DetElement.path())
      item_key = hash32(condition-name)
   ```
      **Condition keys must be unique throughout the detector description.**
   
   * Alignment conditions naming conventions:
     * Alignment-delta conditions are called `alignment_delta`.
     * Fully qualified alignment conditions are called `alignment`.
      DD4hep provided alignment utilities rely on this convention.
   
   * Other conditions can be named freely.
   
   ## Important Notice
   The **Alignment conditions naming conventions** are already used by several utilities involving alignments. If you plan to use these, do not freely ignore these recommendations. When the naming conventions are ignored, these utilities shall not work.
   
   ## Updates to DDCond
   DDCond implements a working conditions cache following the design criteria sketched above. The `conditionsSlice` object implements (though by forwarding to the `ConditionsUserPool`) a `ConditionsMap` interface.
   
   The `DD4hep_ConditionsMapUserPool` plugin implements in a very efficient way this interface using an ordered map. Using the above described key definition, this implementation allows very efficient scans of conditions/alignments etc. of individual detector elements, since conditions which belong to the same detector element are contiguous.
   
   ## Alignment handling/computations
   Using the conditions maps, the computation of (mis-)alignment data from deltas
   is no longer bound to the conditions mechanisms.
   
   A special utility called `AlignmentsCalculator` is put in place (see `DDCore/include/DD4hep/AlignmentsCalculator.h`) to facilitate the computation of a coherent set of alignments given a set of delta-parameters. This mechanism is much simpler, easier to understand and far less code intensive than the previously designed callback mechanism where alignments are obtained using conditions derivation.
   
   ## Update of the existing examples
   
   The example sets in DDDB, `examples/Conditions, examples/AlignDet`, `examples/DDDB` were updated according to the changed mechanism of accessing conditions. Here we can see the real benefits of the new approach: keeping same functionality, the examples became way off simpler. Simply count the number of lines of code.
 
 * 2017-06-17 Marko Petric ([PR#170](https://github.com/AIDASoft/DD4hep/pull/170))
   - Add clang flag to warn about using namespace directive in global context in header
 
 * 2017-06-17 Frank Gaede ([PR#167](https://github.com/AIDASoft/DD4hep/pull/167))
   - renamed the namespace DD4hep::DDRec to dd4hep::rec (see #166)
          - provide backward compatibility to outside world for now
   - moved the interfaces in namespace DDSurfaces to dd4hep::rec
          - provide backward compatibility to outside world for now
 
 * 2017-06-15 Frank Gaede ([PR#165](https://github.com/AIDASoft/DD4hep/pull/165))
   - started to cleanup DDRec
         - don't use  LCDD::getInstance() in SurfaceManager and SurfaceHelper
         -  deprecate unused(?) classes in DDRec/API and DDRec/Extensions
         -  deprecate MaterialManager() using LCDD::getInstance()
 
 # v00-23
 
 * 2017-05-12 Marko Petric ([PR#152](https://github.com/aidasoft/DD4hep/pull/152))
   - Update CI to GCC 7.1 and LLVM 4.0 and include Geant4 10.3
 
 * 2017-05-22 Frank Gaede ([PR#154](https://github.com/aidasoft/DD4hep/pull/154))
   - protect against NANs in Guineapig pairs files in Geant4EventReaderGuineaPig
   - make INFO printout more consistent  with dd4hep style
 
 * 2017-06-07 Frank Gaede ([PR#157](https://github.com/aidasoft/DD4hep/pull/157))
   -  bug fix in test_cellid_position_converter
        - with this no tests for position from cellID lookup should fail
   - re-implement ```CellIDPositionConverter::cellID(pos)```
 
 * 2017-06-08 Marko Petric ([PR#156](https://github.com/aidasoft/DD4hep/pull/156))
   - Mark all fallthroughs in case statements with attributes to suppress warning
 
 * 2017-06-01 Frank Gaede ([PR#155](https://github.com/aidasoft/DD4hep/pull/155))
   - add new class rec::CellIDPositionConverter
         - replaces rec::IDDecoder
         - implement positionNominal(CellID id) and cellID(position)
        - prepare for using alignment map by separating transforms to DetElement and daughter volume
        - do not use deprecated methods/members in VolumeManager
   - add test_cellid_position_converter.cpp
   - add VolumeManagerContext::toElement
        - transform from sensitive volume to next DetElement
 
 # v00-22
 
 * 2017-04-28 Markus Frank ([PR#148](https://github.com/aidasoft/DD4hep/pull/148))
   Improvements to the compact xml processing
   ===========================================
   
   Elements may now be specified within compact in 2 ways:
   1) old way: create an effective element:
   `    <element Z="4" formula="Be" name="Be" >`
   `      <atom type="A" unit="g/mol" value="9.01218" />`
   `    </element>`
   
   2) create element by defining an isotope mixture:
   `    <isotope name="C12" Z="6" N="12"/>`
   `      <atom unit="g/mole" value="xxxx"/>`
   `    </isotope>`
   `.....`
   `   <element name="C">`
   `     <fraction n="0.9893" ref="C12"/>`
   `     <fraction n="0.0107" ref="C13"/>`
   `   </element>`
   
   Improved debugging of compact xml conversions
   The following tags allow to enable increased prinout depending on additional tags in the compact file:
   `    <debug>`
   `      <type name="isotopes"     value="1"/>`
   `      <type name="elements"     value="1"/>`
   `      <type name="materials"    value="0"/>`
   `      <type name="visattr"      value="0"/>`
   `      <type name="regions"      value="0"/>`
   `      <type name="readout"      value="0"/>`
   `      <type name="limits"       value="0"/>`
   `      <type name="segmentation" value="0"/>`
   `    </debug>`
   
   Disable the ROOT TGeo element table from the compact xml. 
   Note: ALL elements must then be specified in the XML material database.
   `    <geometry>`
   `      <clear name="elements"/>`
   `    </geometry>`
   
   By default compact accepts exactly one input file (others may be included therein).
   In order to process iteratively multiple input files, the opening and the closing of the
   geometry steering tags may be added to the compact description. This example 
   gives the default behaviour:
   `    <geometry open="true" close="true"/>`
   
   Please note: per compact file exactly ONE geometry tag is allowed.
   
   
   Debugging the DDG4 geometry conversion mechanism
   =============================================
   New boolean properties of the Geant4DetectorGeometryConstruction object,
   which result in debugging printouts (defaults are OFF):
     DebugMaterials
     DebugElements
     DebugShapes
     DebugVolumes
     DebugPlacements
     DebugRegions
     PrintPlacements
     PrintSensitives
 
 * 2017-04-28 Ben Couturier ([PR#146](https://github.com/aidasoft/DD4hep/pull/146))
   * Trivial fix for the DDDB converter to create paramphysvol3D volumes, which are otherwise ignored.
 
 * 2017-04-20 Andre Sailer ([PR#145](https://github.com/aidasoft/DD4hep/pull/145))
   - LCIOOutput: Add setting of ProducedBySecondary bit for SimTrackerHits if the hit is produced by a particle that is not stored in the MCParticle collection, needs lcio 2.8
 
 * 2017-05-05 Andre Sailer ([PR#150](https://github.com/aidasoft/DD4hep/pull/150))
   - Always create dd4hepConfigVersion.cmake in CMAKE_INSTALL_PREFIX and cmake folder
   - Create DD4hepConfig.cmake also in cmake folder
   - renamed Cmake Macro GENERATE_PACKAGE_CONFIGURATION_FILES to DD4HEP_GENERATE_PACKAGE_CONFIGURATION_FILES so it does not clash with the macro of the same name in ilcutil/cmakemodules
 
 * 2017-05-07 Andre Sailer ([PR#151](https://github.com/aidasoft/DD4hep/pull/151))
   - Use cmake to create Version.h file to contain dd4hep version information and macros
   - Change the way dd4hep package version is defined and set standard cmake variables for this purpose
 
 # v00-21
 
 * 2017-04-03 Marko Petric ([PR#142](https://github.com/AIDASoft/DD4hep/pull/142))
   - Update to the CI system:
     - Install directly cvmfs on base system, which removes the need for the parrot connector 
     - Replace CernVM docker with plain docker
     - This reduces the build run time from 50 min to 25 min
 
 * 2017-03-27 Shaojun Lu ([PR#134](https://github.com/AIDASoft/DD4hep/pull/134))
   - Set verbose true for G4EmSaturation to printout Birks coefficient.
 
 * 2017-03-29 Frank Gaede ([PR#139](https://github.com/AIDASoft/DD4hep/pull/139))
   - add a utility to dump the B-field for a given Volume
           - usage: dumpBfield compact.xml x y z dx dy dz [in cm]  
           - will dump the B-field in volume [-x:x,-y:y,-z,z] with steps [dx,dy,dz]
 
 * 2017-03-29 Joschka Lingemann ([PR#138](https://github.com/AIDASoft/DD4hep/pull/138))
   - Direct implementation that calculates eta from cartesian coordinates
   - Fix: Add registration of Phi-Eta segmentation
 
 * 2017-03-29 Joschka Lingemann ([PR#137](https://github.com/AIDASoft/DD4hep/pull/137))
   - Adding GridRPhiEta a segmentation of equidistant size in R, Phi and Pseudorapidity
   - Adding GridPhiEta a segmentation of equidistant size in Phi and Pseudorapidity
 
 * 2017-03-28 Markus Frank ([PR#135](https://github.com/AIDASoft/DD4hep/pull/135))
   - Accidentally the Segmentations of Joschka were added in the wrong place of the hierarchy.
      I removed them. He will later add them to the proper location.
   - Some C++ warnings concerning the C++11 standard were also fixed.
 
 * 2017-03-24 Yorgos Voutsinas ([PR#132](https://github.com/AIDASoft/DD4hep/pull/132))
   - modifying the LayeredCalorimeterData struct in order to cope with conical shaped calorimeters
 
 * 2017-03-31 Markus Frank ([PR#143](https://github.com/AIDASoft/DD4hep/pull/143))
   - Add new test for multi segment multi collections segmentations using a calorimeter endcap.
      See also: https://github.com/AIDASoft/DD4hep/issues/141, which is still unresolved,
      but seems not to be directly related to the Monte-Carlo truth handling.
   - Side effect: add Geant4EventActions to dump hits and particles
   - Fix a linker problem for unicode tags.
 
 * 2017-03-31 Frank Gaede ([PR#140](https://github.com/AIDASoft/DD4hep/pull/140))
   - clarify documentation for CartesianField and implementations
   - make clear that  void fieldComponents() has to add
      the new field to the given field vector
 
 * Marko Petric 2017-03-23 
   - Convert Release notes to markdown
   - Add some text about WIP and issue tracking
   - Add CONTRIBUTING.md and PULL_REQUEST_TEMPLATE
 
 * Markus Frank 2017-03-17
  
  - Add a new input type by parsing JSON files. The basic json interpreter
     is present and offers essentially the same interface as the XML persers.
     The integration to the compact dialect however is not yet done.
     It should become however a valid alternative to parsing XML files
     with a small maintenance overhead, since the enhancement implementation
     present in XMLDimesion.h, XMLDetector.h and XMLChildValue.h is shared
     and instantiated for both.
 
 * Markus Frank 2017-03-10
  
  - New round to kill coverity deficiencies.
  - Add exception try-catch clauses around various main programs in UtilityApps
     See UtilityApps/src/main.h for details.
 
 * Markus Frank 2017-03-09
  
  - Fix issue with long volume ids exceeding 32 bits.
     Test added in examples/ClientTests
  - Fix volume manager id identical placed volumes are used in different places of the hierarchy.
     Test added in examples/ClientTests
  - Remove various svn left-overs (ID$ strings etc.)
 
 
 * Frank Gaede 2017-02-10
  
   - allow event readers to create more than one vertex per event
      this should be possible as most generator formats allow to specify
      more than one event vertex 
   - changed signature of Geant4EventReader::readParticles(int,Vertex*, Particles&)
         to Geant4EventReader::readParticles(int,Vertices&, Particles& )
   - implement in LCIOEventReader, Geant4EventReaderHepEvt and Geant4EventReaderHepMC
   - for now still one vertex only is created using the first final state particle
         for HepEvt and LCIO
 
 # v00-20
 
 * Frank Gaede 2017-01-13 
 - fix computation of radiation and interaction lengths
 - require the density to be specified in the materials xml file
  
 * Frank Gaede 2017-01-04 
 - adopt numbers in test_surface.cc to elements.xml
 - use elements.xml generated with plugin in DDTest
 -  add ROOT version to dumped element table
 
 * Frank Gaede 2016-12-22 
 - fix test_surfaces by adapting to elements.xml
 - fix test_units by including elements.xml
  
 * Markus Frank 2016-12-21 
 - Add plugin to dump the default ROOT element table
  
 * Markus Frank 2016-12-20 
 - Remove obsolete build flags
  
 * Markus Frank 2016-12-19 
 - Add Multi-threading conditions example
  
 * Andre Sailer 2016-12-16 
 - Add drivers for Beampipe, Mask and Solenoid from lcgeo, changed name to dd4hep_*
  
 * Rosa Simonielo, Frank Gaede 2016-12-15 
 - add new struct rec::NeighbourSurfacesStruct defined for neighbouring surfaces
  
 * Frank Gaede 2016-12-14 
 - fix library pathes in env scripts for macos
 - use DD4HEP_LIBRARY_PATH and full lib path on mac
 - apply rpath compiler settings to GaudiPluginService
 - make compatible w/ Geant4 10.3
  
 * Marko Petric 2016-12-13 
 - Fix compiler flag handling
  
 * Daniel Jeans 2016-12-08 
 - add utility graphicalMaterialScan
  
 * Markus Frank 2016-12-07 
 - Fix compiler error on MacOSX gcc 4.9
  
 * Marko Petric 2016-12-07 
 - Remove few tests from Travis
 - move flag to CMAKE_SHARED_LINKER_FLAGS
 - Remove the dynamic lookup on runtime for libs on mac
  
 * Markus Frank 2016-12-05 
 - First version of conditions and alignments
  
 * Andre Sailer 2016-12-06 
 - DDTest: fix location to install DDtest header files
 - Remove minimum required cmake version from DD4hepBuild, this interferes with other packages depending on dd4hep
  
 * Marko Petric 2016-12-02 
 - Fix missing CLHEP in thisdd4hep.sh
 - Clean up FindPYTHON.cmake file
 - Change gaudi auto_ptr to unique_ptr since the auto is deprecated
 - Fix initAClick
  
 * Marko Petric 2016-11-29 
 - Fix rpath issues on mac with python
 - Add custom DynamicPath on mac when loading python libs
 - Add function to set the DD4HEP_LIBRARY_PATH
  
 * Marko Petric 2016-11-28 
 - Update all minimum CMake versions
 - Fix gitlab builds
 - Rename MakeRootMap to MakeGaudiMap for consistency
 - Remove ROOT5 things and make approprite fixed to the usage of ROOTConfig.cmake
  Remove FindROOT.cmake and use from now on ROOTConfig.cmake
  
  
 * Markus Frank 2016-11-30 
 - New version of conditions handling
  
 * Andre Sailer 2016-11-25 
 - Fix ProductionCut conversion in Geant4Converter.cpp: cut is a range
  
 * Markus Frank 2016-11-24 
 - Fix linker errors on MAC
 - Remove compiler warnings on MACOSX
 - First fixes to version of alignment constant processing also remove where visited the $ statements in the files.
 They are useless, since git does not support them. Fixed some tests, which no longer properly worked in
 the conditions area.
 - First usable version of alignment constant processing
  
  
 * Markus Frank 2016-11-16 
 - Try to improve efficiency using C++11 default operations
  
 * Markus Frank 2016-11-10 
 - Simplify opaque data mappings for conditions
  
 # v00-19
 * 2016-11-17 D.Jeans
 - rewritten MegatileLayerGrid class 
   - not backward compatible 
 
 * M.Petric:
 - improved Travis CI configuration 
 - remove some tests from CI
 
 # v00-18
 
 * 2016-11-09 F.Gaede
 - updated rec::LayeredCalorimeterData::Layer:
   - remove deprecated thickness 
   - add phi0  
 - add copy assignement to rec::MaterialData
 
 * 2016-11-08 M.Frank
 - Improve conditions handling. Started to implement using simple telescope
   detector from C.Burr.
 - Add variable DD4HEP_LIBRARY_PATH to be used on MacOSX El Capitane
   to overcome DYLD_LIBRARY_PATH protection issues.
 - Fix to copy with negative(rebased) IDDDescriptor fields
   (affects IDDDescriptor and VolumeManager).
   2 New tests:
   - ClientTests/Bitfield_SidesTest.xml to test readout string:
     system:8,barrel:-2
   - ClientTests/Bitfield_SidesTest2.xml to test readout string:
     system:16,barrel:16:-5
     
 * 2016-10-18 M.Frank
 -  Due to pressure of the FCC folks, I tried to implement a more dd4hep like implementation of the
   the segmentation objects. For testing only CartesianGridXY. If this mechanism works,
   it could be a starting recipe for the rest of the segmentations. The draw-back of this approach is,
   that assignments are not reversible:
   dd4hep::CartesianGridXY xy = readout.segmentation();  // Works
   dd4hep::Segmentation seg = xy;                    // Should not work
 
 -  Reason: the managed objects are different....at some point in time I will have to find a
   clean solution for this, but the required changes for such a solution shall be manageable.
 
 # v00-17
 
 * 2016-09-29 V.Volkl
   - Small fixes and extensions of DDEve. Show "Views" menu even if specifying xml on the command line.
     Add possibility to specify event data in EveDisplay method, rather than having to select it in the gui dialogue.
     Selects FCC EventHandler if specified in the config xml (as an "eventHandler"-attribute to the "display" node),
     but keeps default behavior if not.
 
 
 * 2016-08-24 M.Frank
       - Adding first somehow useful implementation to use conditions and the consequent loading thereof.
         Used by the DDDB implementation/example. DDDB is an alternative way to populate the dd4hep
         detector description using LHCb's detector description database.
         The reason is, that only a running experiment has a reasonable base to conditions data
         to excercise the dd4hep conditions.
         If interested, please have a look in the DDDB examples.
 
   - Still TODO:
     - A formal way to bootstrap the conditions loading still has to be found.
     - Conditions loading from XML files and a small comprehensive example.
 
 # v00-16
 * 2016-07-26 Shaojun Lu  
 - Added new MegatileLayerGridXY segmentation for Scintillator strip Ecal, which is implemented by K.Kotera, 
  and used by SEcal04Hybrid geometry driver.
 
  - many ( minor fixes ) by F. Gaede, M. Petric, A Sailer, ...
 
 * 2016-06-24 M.Frank
 - Implement multiple segmentations.
   Though one readout objects (associated to one DetElement) may only have on segmentation,
   The MultiSegmentation type allows to have several sub-segmentations, which can be chosen
   from.
   Please see examples/ClientTests/*/MultiSegmentations
 
 - At the same time allow the readout object to defined multiple collections through
   the IDDescriptor.
   Please see examples/ClientTests/*/MultiCollections
 
 - The combined example can be found in
   Please see examples/ClientTests/*/NestedSegmentations
 
 
 
 * 2016-05-03 M.Frank
 - Green light is ON. You may use revision 2237 and above.
 
 * 2016-05-03 M.Frank
 - **Mega commit. Do not use until green signal arrives with seperate release notice.**
 - Package DDDB: Prove of concept, that we can populate the geometry also from other
   sources than xml files obeying the lccdd notation.
 - DDCore/XML: Implement the possibility to use external entity resolution for Xerces.
   There is not equivalent in TinyXML (AFAIK).
 - Remove some of the Spirit parsers, since the libraries are getting way too big.
   This implicitly assumes, that object properties of 'exotic' types such as
   deque<long double> etc. are not really used. If you need properties stay to the obvious:
   string, int float, double and vectors, maps and sets thereof!
 - DDG4 needed to public the DDG4Python include directory (Now in DDG4/Python).
   Reason: try to create ROOT 6 dictionaries, which can be relocated for release purposes.
 - ROOT 6 dictionary generation: Create dictionaries with the additional flag:
   "-inlineInputHeader" which physically includes the header files used to generate the 
   dictionaries --> relocatability.
 
 * 2016-03-21 M.Frank
 - Add additional vertex argument to EventReader::readParticles, which supposedly should
 
 * 2016-03-03 M.Frank
 - Improve/complete job options type palette. 
 - Allow modify the Geant4IsotropGenerator to shoot particle distributions according
   to several distributions:
   flat in : uniform, cos(theta), eta/pseudorapidity, ffbar (1+cos^2 theta)
   Option: generator.Distribution = 'cos(theta)'
   Default is uniform.
 
 # v00-15     
 * 2016-02-15 A.Sailer
 -  LCIOStdHepReader.cpp
    - fixed memory leak, compiled and valgrinded
 
 * 2016-02-10 F.Gaede
 - added utility  dd4hep::xml::setDetectorTypeFlag()
   to set the TypeFlag from xml element <type_flag type="0x42"/>
 - select detectors with 
   dd4hep::DetectorSelector(description).detectors(  ( dd4hep::DetType::TRACKER | dd4hep::DetType::ENDCAP )) ;
 - used in UtilityApps/dumpdetector.cc
 - added detector_types.xml with int constants defined in DetType.h, include with :
   `<include ref="${DD4hepINSTALL}/DDDetectors/compact/detector_types.xml"/>`
   - add elements to xml, e.g.
     <type_flags type="DetType_TRACKER +  DetType_ENDCAP  + DetType_PIXEL + DetType_STRIP "/>
 
 * 2016-02-10 M.Frank
 - DDCond:
     First implementation of conditions access. Required some movements of files
     from DDG4 (Properties) and some changes in the core conditions implementation.
     The basic infrastructure is now present. Don't know yet however how buggy it is...
 
 * 2016-02-05 F.Gaede
 -  added DetElement::typeFlag() and DetElement::setTypeFlag(unsigned int types)
 - added utility class DetType for setting detector type properties in type flag
 
 * 2016-02-03 N.Nikiforou
 - DDDetectors
   - Added plugin dd4hep_GenericSurfaceInstallerPlugin, copied from lcgeo
     to allow installation of surfaces to any sliced detector
   cmake/Doxyfile.in
   - Added DDDetectors to the sources directory so Doxygen picks up the
     plugin documentation
 
 * 2016-02-02 F.Gaede
 - set momentum at endpoint (if lcio version > 2.6 ) for MCParticles in Geant4Output2LCIO.cpp 
 - fixed printlevel in Geant4Action::print()
 - removed random lines drawn in teveDisplay
 - dont't print DetectorData by default in dumpdetector
 
 * 2016-02-02 A.Sailer
 - DDG4
   - Implemented SimulatorFlags (DDFORHEP-17)
     * In ParticleHandler: vertexIsNotEndpointOfParent, Stopped, leftDetector
     * Steerable distance for vertexIsNotEndpointOfParent
     * TCUserParticleHanlder Simulator flags: DecayedInTracker, DecayedInCalorimeter
 
 * 2016-01-21 A.Sailer/M.Frank
 - DDG4
   - Improved user defined physics constructors
     * Allows user defined global rangecut
     * Allows extending particle table (e.g. B-Hadrons unknown to geant4)
 
 * 2016-01-18 F.Gaede
 - fixed default c'tors in DDRec/DetectorData.h  to zero initialize sub-structures (LayerLayout etc)
 
 * 2016-01-13 F.Gaede
 - allow the default sensitive action to be a tuple with parameter dictionary in DDG4.py/ddsim.steer e.g.:
   SIM.action.tracker = ("Geant4TrackerWeightedAction", {"HitPositionCombination" : 1 , "CollectSingleDeposits" :  False } )
 - fixed endpoint in MC-truth particles
  
 * 2016-01-11 F.Gaede
 - fix hit momentum in Geant4TrackerAction (Geant4SDActions.cpp)
 
 * 2016-01-11 A.Sailer
 - DDG4
   - Add LargestAcceptableStep to field setup
 
 * 2016-01-07 A.Sailer
 - DDG4
   - Fix the logic for skipping of events at the start of input files: LCIO, HepMC, stdhep and HepEvt
   - Event number in lcio outputfile takes skipped events into account now
 
 * 2016-01-06 F.Gaede
 - bug fix in DDSurfaces::ISurface for surface properties (orthogonal/parallel to z)
   (affected ILD VXD)
 
 * 2016-01-05 F.Gaede
 - added print functions for rec::DetectorData objects
 - used in dumpdetector:
   dumpdetector compact.xml -d 
 
 
 * 2015-12-09 N.Nikiforou
 - UtilityApps/teveDisplay
   - Modified teveDisplay to have three separate collections of surface vectors (u,v,n) 
     instead of one collection. Now the vectors are colored differently.
   - Changed signature of getSurfaceVectors() to allow selection of o,u,v,n vectors to 
     add to the collection, added option for name and color of collection.
   - Renamed surface list collections to "HelperSurfaces" and "SensitiveSurfaces".
   - Changed signature of getSurfaces() to allow setting of name and color of collection.
   
 
 * 2015-12-01 M.Frank
 - DDG4
   - Remove some of the compilation warnings
   - Remove energy cut in sensitive detectors
     If you though need, use a Geant4Filter to mask the action processing
   examples/CLICSiD
   - Add a few tests for materialscan and simulation setups using XML or CINT.
   examples/ClientTests
   - Add a few tests for materialscan and simulation
 
 * 2015-11-24 M.Frank
 - DDG4
   - Implementation of multi-threading mode.
     To use and understand, please consult the DDG4 manual from the doc area.
   - "Old" Single threaded mode and functionality is preserved.
   - Numerous new classes supporting thread and master specific setup
     functionality.
   - Support for python configuration (see manual for details)
   - Support for global Geant4Actions executing in thread reentrant shared mode.
     (see manual for details)
   - DDG4 examples: DDG4/examples/CLICSidSimu.py deleted and replaced with:
     1) DDG4/examples/SiDSim.py  (single threaded, old example)
     2) DDG4/examples/SiDSim_MT.py (multi threaded version of SiDSim.py)
 
  -DDCore:
   - Support user formats for the default printout statements for nicer printouts.
   - Removal of compiler warnings
 
 * 2015-11-23 F.Gaede
 - added glbal method dd4hep::versionString() 
 
 * 2015-11-13 S.Lu
 -  Added a new AHcal Barrel segementation: TiledLayerGridXY, to be used e.g.  
    for the ILD AHcal Barrel Sensitive layer segmentation design.
 
 * 2015-10-30 F.Gaede
 - fixed LCIOFileReader to use sequential reading mode
   as using direct access always required runNum==0 and sequential evt nums ...
    
 
 * 2015-10-15 F.Gaede
 - DDSurfaces::ISurface/Surface
   - added implemation of conical surfaces 
     - ICone, VolConeImpl, VolCone, ConeSurface
 
 * 2015-10-13 M.Frank
 - DDG4
   - Remove explicit constructors for modular physics lists.
     Use the native Geant4 provided G4PhysListFactory instead.
     The physics list is instantiated as before with the "Extends" property.
   - Implement angular ranges in the Geant4IsotropeGenerator for phi [0,2pi] and theta[0,pi]
   - New sensitive detector Geant4TrackerWeightedAction
     Attempt to properly process combined deposits in tracking detectors.
   - Debug component Geant4SurfaceTest similar to the standalone program
     test_surfaces, but to be appended as a DDG4 event action for event by event
     tests of hits.
 
 * 2015-10-09 M.Frank
 - DDG4
   - Extend the functionality of the DDG4 plugins
     Geant4InteractionVertexBoost and Geant4InteractionVertexSmear.
     If the Mask property is set to -1, all interactions present
     at call time are smeared/boosted according to the parameters.
     Note, that the position of the plugins within the generation 
     sequence is important.
   - Add a new generator Geant4GeneratorWrapper to allow the use
     of native G4 generator classes such as the G4ParticleGun or
     the G4GeneralParticleSource. Still to be tested.
   - Extend the Geant4Random functionality: May now be instantiated
     like any other Geant4Action. Users may set the seed or the 
     luxury level.
     All calls to HepRandom (CLHEP) or gRandom (ROOT) will re-use 
     this instance. See DDG4/examples/CLICRandom.py for illustration.
   - Updated DDG4 manual.
 
 * 2015-09-30 F.Gaede
 - updated createGearForILD.cpp to use new parameters in LayeredCalorimeterData
   ( innerThickness, innerRadLength, etc)
 
 
 * 2015-09-15 F.Gaede
 - refactoring of Surface classes:
     - made VolSurface a reference counting handle to 
       a polymorphic pointer of type VolSurfaceBase
       - this should facilitate the creation
         of dedicated surface classes for special cases
         such as inside the beampipe or the face of the calorimeter
 
 * 2015-08-27 F.Gaede
 - added macros DD4HEP_VERSION_GE(MAJV,MINV) and DD4HEP_VERSION_GT(MAJV,MINV)
   to Detector.h
 
 - increased version number to v00-15
 
 
 * 2015-08-20 M.Frank
 - DDCore: Modularize/abstract plugin manager 
 - VolumeManager: Fix bug propagating sensitive detectors
   Showed up in the examples of nested detectors
 
 
 * 2015-08-12 N.Nikiforou
 - DDCore/XML: Added new helper functions to Layering engine:
    - double absorberThicknessInLayer(xml::Element e) : 
      returns total absorber thickness in given layer
    - void sensitivePositionsInLayer(xml::Element e, std::vector<double>& sens_pos) :
      provides positions of sensitive slices within a layer with respect to the 
      center of the layer
 
 
 * 2015-07-25 M.Frank
 - DDSegmentation: Remove several 'shadow' warnings.
 
 - New build system for the dd4hep core, which greatly simplyfies the cmake files
   for the various sub-packages. 
   Tested with Andre's build script doc/CompileAllOptionPermutations.sh.
   (GEAR usage not tested though)
 
 # v00-14     
 * F.Gaede
 - fixed writing of generator status for lcio::MCParticle
   in Geant4Output2LCIO.cpp
 
 * A.Sailer 
 - Add missing scope to /DD4hep/Factories.h, to not force everyone to use using namespace
 
 * F.Gaede: 2015-07-15
 - changed type in SurfaceList and SurfaceMap from Surface to ISurface
 - added methods length_along_u/v() to ISurface
 - moved setting of CMAKE_CXX_FLAGS (if DD4HEP_USE_CXX11) from DD4hep.cmake to CMakeLists.txt
 
 * 2015-07-11 M.Frank
 -  added starter docs dd4hepStartersGuide.pdf
 
 *** **Important** ***
   **Before updating, backup your existing and working checkout. Though I was running 
   the basic tests, there may be unchecked corners of the software.**
 
 Notes:
 - Backwards compatibility mode for the usage of ROOT 5 and ROOT 6 alternatively.
 - For ROOT 6 the Gaudi PluginService is used and added to the distribution.
 - dd4hep is distributed with a licence. See $DD4hepINSTALL/LICENSE for details.
 - In the doc area the $DD4hepINSTALL/doc/CREDITS file everybode should add her/his 
   name, if contributed significantly.
 - Unfortunately this meant to add/change the headers of all files and give a 
   pointer to the licence file. If I accidentally changed the author name, please
   chagne it back.
 - The plugin factory declaration statements were changed to accomodate both
   ROOT 5 and ROOT 6 and to keep the number of 'ifdef' statements at a minimum.
 - TODO: Properly change the cmake scripts to accomodate for ROOT 6 and the 
   automatic switch when building dd4hep. 
 - For reference reasons: this commits is revision 1812 + 1813 (DDDetectors)
 
 # v00-13  
 * 2015-07-03 F.Gaede
 - updated doxygen for detector rec::DetectorData structs and usage in convertToGear
 
 * 2015/07/02 Nikiforos Nikiforou
 - Added isRadiator() helper function in DDCore/XML/XMLDetector.h/cpp 
   Mirroring functionality of isSensitive() and used in geometry drivers
   e.g. to calculate total absorber thickness
   
 - Extended LayeredCalorimeterStruct in DDRec/DetectorData.h to include 
   additional parameters required by Pandora:
   - inner_phi0 (e.g. alignment for inner symmetry)
   - outer_phi0 (e.g  aligment for outer symmetry)
   - NOTE: phi0 still remains but is deprecated
   - gap0 (e.g stave gap along r-phi)  
   - gap1 (e.g middle stave gap along z)
   - gap2 (reserved for future use)
 
 *  2015-06-29 A.Sailer
  - always store lcio collections, even if they are empty in Geant4Output2LCIO (DDG4/ddsim)
 
 
 * 2015-06-29 F.Gaede
 - changed env scripts to prepend to library pathes (dd4hep and dependant packages)
    - using a newer lcgeo version than the one provided in ilcsoft can simply
         be done w/ source ./bin/thislcgeo.sh 
               
 # v00-12  
 * 2015/06/17 Markus Frank
 - Add possibility to block access to constants by name from Detector.
   Functionality enabled by a constant named "Detector_InhibitConstants" with value "1", "True", "Yes".
   Test: geoDisplay -compact file:../DD4hep.trunk/examples/ClientTests/compact/InhibitConstants.xml 
 
 - Add DetectorHelper handle object to easily access the sensitive detector object of a detector
   using either the subdetector name or the detector element (or one of its children).
   See: dd4hep/DetectorHelper.h
   Test: ``` 
   geoPluginRun -input file:../DD4hep.trunk/examples/CLICSiD/compact/compact.xml \
                      -plugin CLICSiD_DetectorHelperTest  \
          optional:  -<detector-name (default:SiVertexEndcap)>  [Note the '-'!!!] 
          ```
 
 - Check when adding new sub-detector detector elements if a given one already exists.
   if yes: exception.
   Test: `geoDisplay -compact file:../DD4hep.trunk/examples/ClientTests/compact/DuplicateSysID.xml`
 
 
 * A. Sailer
 - DDSegmentation: Added function cellDimension which returns the dimension of any given cell
 
 * S.Lu:
 - Added a switch for BirksLaw to Geant4StepHandler. 
   For backward compatable, by default, do not apply BirksLaw, and apply BirksLaw with call 'doApplyBirksLaw()'.
   added optional Geant4ScintillatorCalorimeterAction
 - Added one 'Geant4ScintillatorCalorimeterAction' into DDG4 plugins Geant4SDActions for  scintillator to take 
   Geant4 BirksLaw effect as sensitive detector active layer.
 
 * F.Gaede
 - added SurfaceManager class that holds maps of surfaces for 
   "world","tracker","calorimeter","passive" and all individual subdetectors
     - to be used in reconstruction code where a lookup from cellID
       to corresponding surface is needed
     - needs plugin "InstallSurfaceManager" to be in the compact file
     - access via:  
       SurfaceManager surfMan = *description.extension< SurfaceManager >() ;
       const SurfaceMap& surfMap = *surfMan.map( "world" ) ;
 - renamed old SurfaceManager to SurfaceHelper
 
 - added method: Volume createPlacedEnvelope()
   - to be used in all LC detector drivers to create a placed envelope volume
     rest of the detector is then instantiate in this volume
 
 - added BooleanShape plugin for creating generic boolean
   shapes (subtraction, union or intersection )
    - to be used for envelope definition in xml
 
    - added new build_type: BUILD_ENVELOPE 
       - can be used to visulize envelopes only (geoDisplay, teveDisplay,...)
 
 * 2015/05/22 Nikiforos Nikiforou
 - Fixed bug in DDG4/lcio/LCIOConversions.cpp, which stored only the PDG of the primary particle 
   in multiple particle contributions in SimCalorimeterHits instead of both the primary and secondary PDGs.
 
 
 * 2015/05/13 Markus Frank
 - Fix bug in DDG4, which forced DDG4 to exit if a property from the Geant4 prompt could
   not be set. No an error message is printed and the prompt is returned to the user.
   (Bug submitted by A. Sailer)
 
 * 2015/05/11 Andre Sailer
 - CMake updates:
   - Split libraries into components: use find_package(dd4hep COMPONENTS <component> [...] )
     to find the components you need.
   - At the moment there are these components are sensible to link against: DDRec, DDG4, DDEve, DDSegmentation
   - To link against the librarie use either dd4hep_COMPONENT_LIBRARIES or dd4hep_<COMPONENT>_LIBRARY,
     where <COMPONENT> needs to be replaced by the UPPER case name of the component
 
 * 2015/05/09 Markus Frank
 - Allow to access detectors by type from description.
   - The sensitive type of a detector is set in the 'detector constructor'.
   - Not sensitive detector structures have the name 'passive'
   - Compounds (ie. nested detectors) are of type 'compound'
 - Dump detector types using plugin:
 
          geoPluginRun -plugin DD4hepDetectorTypes -input <compact-file>
 
 * 2015/03/12 Markus Frank
 - Add support for ellipsoids in gdml/description and geant4 conversion.
 - Allow to include files with environment variables from compact notation.
 
 * 2015/03/09 Markus Frank
 - Finalize move to geant4 version 10, started by A.Sailer
 - Add non-isotrop particle generator in DDG4 (request P.Kostka)
 - Isolate ROOT plugin manager as start to move to ROOT 6
 
 # v00-11
 * F.Gaede
 - DDDetectors
   - new Package containing generic dd4hep detector palette (MF)
   - added 'dimension' argument to dd4hep_SiTrackerBarrelSurfacePlugin (FG)
     to handle pixel and strip detectors 
 
 - DDRec (Frank Gaede)
   - added simple data structs in DDRec/DetectorData.h
     providing interface needed for GEAR:
   - added plugin for creating GEAR file for ILD
   - Extended IDDecoder to give access to layer, system and barrel/endcap information. (CG)
     IDDecoder is now independent of Readout object, instead it finds the correct
     readout based on the cellID / position
   - fixed surface implementations: removed inline virtual functions
   - added methods:
     VolSurface::length_along_u()
     VolSurface::length_along_v()
     Surface::volumeOrigin()
     CylinderSurface::center()
     ICylinder::center()  
 
 - DDG4 (Markus Frank)
   - Fix Geant4 Primary input conversion
   - Fix LCCollectionVec for LCIO output
   - fixed units for MCParticle output (FG)
   - fixed generator status: set to 0 if (FG)
     particle created in simulation
   - Add cylindrical tracking volume to particle handler
   - More modular user particle handling with example Geant4TCUserParticleHandler
   - fixed charge (don't devide by three) (FG)
   - fixed logic for writing out MCParticles: (FG)
     - don't write particles created in calo
       unless scattered back into tracker)
     - don't write particles created in tracker
       if below MinimalKineticEnergy ( Geant4ParticleHandler)
   - Added HepMC ascii reader
   - added simply main program 'dd_sim' to run  (FG)
     a DDG4 based simulation with xml configuration files
   - change TrackerCombine SD to use energy weighted positions
   - added utility to dump generated files: scripts/dumpDDG4.C
   - fixed dictionaries for map iteration on MacOS in python (FG)
     -> added operators ==/!= for map<>::iterator
   - added component to allow the setup of the magnetic field tracking in Geant4 from python
 
 - DDCore (Markus Frank)
   - fixed Detector el-mag. field converter 
   - add generic surface installers 
   - allow for string constants in description define section
   - added arguments for surface plugins
 
 - DDSegmentation (FG) :
   - fixed compiler warning w/ left shift count >= width of type 
   - fixed wrong type string "CartesianGridXY"
   - added CartesianGridYZ
   - Implementation of a Polar R-phi segmentation  (MP)
   
  - examples 
   - add new test MiniTel(escope) to ClientTests (MF)
   - moved old obsolete examples to attic
   - add new example: LHeD_tracker (MF) 
   - add new example: SimpleDetector (FG)
     (ILD like VXD and SIT )
     
 - CMake:
   - made DD4HEP_USE_BOOST an option flag (FG)
   - added dd4hepG4 library dependence to DDEve (MF)
   - disable dot -> have simpler (and faster) inheritance graphs w/ Doxygen
   - fixed missing search field in Doxygen doc (FG)
   - include boost automatically if build with Geant4
 
  
 - Documentation
   - improved Doxygen documentation (MF)
   - added manual for DDRec (FG)
   - new version of the dd4hep manual (MF)
   - fixed code formating with emacs style:
     ./doc/format_code.sh
 
 - removed subpackages ( moved to https://svnsrv.desy.de/public/aidasoft/DD4hep/attic ):
       DDExamples_obs/
       DDSense/
       examples/ILDExDet/
       examples/ILDExSimu/
       examples/firstExample/
       examples/noviceN04/
 
 - enabled testing in nightly builds with cmake, ctest and cdash (FG)
 
 - plus many small bug fixes  (use svn log for details )
 
 * 2014/09/26 Markus Frank
 - Quite some effort to improve the doxygen documentation.
   The current revision is can be found at:
   https://cern.ch/frankm/DD4hep/html/index.html
 
 * 2014/02/06 Markus Frank
 - DDDetectors: Add example surface plugin with arguments.
     - example code: DDDetectors/src/SurfaceExamplePlugin.cpp
     - compact:
 ```   
        <plugin name="DD4hep_SurfaceExamplePlugin">
           <argument value="SiTrackerBarrel"/>
           <argument value="aa=1*mm"/>
           <argument value="bb=2*cm"/>
           <argument value="cc=3*m"/>
        </plugin>
 ```
 
     - output:
     
 ```cpp
     SurfaceExamplePlugin: argument[0] = SiTrackerBarrel value = -1
     SurfaceExamplePlugin: argument[1] = aa=1*mm value = 0.1
     SurfaceExamplePlugin: argument[2] = bb=2*cm value = 2
     SurfaceExamplePlugin: argument[3] = cc=3*m value = 300
 ```
 
 * 2014/08/15 Markus Frank
 - DDG4: Impreoved LCIO handling for DDG4
 - DDG4: Input handling:
   - LCIO input file reading with multiple *independent* inputs
     to support overlay, multiple interactions, etc.
   - Primary verex smearing independent for each input
   - Primary vertex boosts independent for each input
 - DDG4: Output handling
   - MC Particle handling
   - Improved MC truth handling for produced Hits.
     Still needs revisiting.
 
 # v00-10      
 *  Frank Gaede
 - fixed version numbers and release notes for release v00-08 and v00-09
   ( both have the wrong version number for the libraries 0.7 !)
 - added ./doc/prepare_a_release.howto
 - added new method to BitField64: setValue(unsigned lowWord, unsigned highWord )
  - added some simple unit tests for BitField64
 
 
 * 2014/08/15 Markus Frank
 - DDG4 Add possibility for user hook to the particle handler +
   Data member to store additionbal particle data for the
   output stage.
 - Allow to display MC particles in DDEve
   Add small help file describing how to start DDEve.
   doc/DDEveManual.pdf
 - Update CLICSiD Example.
 
 # v00-09      
 * 2014/08/07 Markus Frank
 - DDG4: First version to support MC truth in DDG4 including 
   particle filtering to optimize the size of the MC record.
 - DDG4 fix SimpleCalorimter sensitive action and properly support
   hit aggregations.
 - DDEve smaller modifications to support DDG4IO if dd4hep was 
   built with the Geant4 option ON.
 
 # v00-08
 - Some minor fixes:
   - made compatible with older geant4 versions (9.5)
   - add Bitflag to store CellID1 in SimCalorimeterHit collections
   - fix position conversion from Geant4 to ROOT
   - add cellID determination to SensitiveAction
   - ...
 
 
 * Andre Sailer, 2014-07-17
 - Unify cmake option variables, small cmake corrections
 - Change options `_WITH_` to `_USE_`
 - Print Warning that variables with `_WITH_` are deprecated
 - Change Defintions to `_USE_` as well
 - Add REQUIRED to find_package geant4 and xercesc if they are turned on
 - Updated documentation
 - Updated ILDExDet example
 
 * Christian.Grefe, 2014-07-15
 - Made DDSegmentation optionally a stand-alone package
   create DDSgementationConfig.cmake when build as part of dd4hep
 
 * Markus Frank, 2014-07-02
 - add LCIO conversions from DDSim - sensitive detectors 
   can now simply instantiate LCIO Sim hits
   
 * 2014/06/30 Markus Frank
 - DDG4: Support user (context-) extensions for Geant4.
   User contexts are availible for events and runs. The contexts
   are accessible from the Geant4Context meber of each Geant4Action,
   the base class for all processing entities.
    - Adding a context:
 ```
       context()->event().addExtension(pointer_to_object, typeid(TYPE), 0);
       or 
       context()->event().addExtension<TYPE>(pointer_to_object);
       In the first case the object is NOT DELETED at the end of the event.
       In the second case the object is deleted.
 ```      
     - Accessing the context:
 ```    
           TYPE* ctx = context()->event().extension<TYPE>(false);
       The boolean argument indicates if an exception should be thrown
       if the extension is not present ie. here no exception.
 ```      
 - DDCore: adjust a few print statements.
 
 * 2014/06/27 Markus Frank
 - Separate XML loading from Detector implementation.
 - New package: DDEve: a bit more sophisticated TEve specialization
 - To start use examples/CLICSiD/compact/DDEve.xml
 - DDEve can interface currently to ROOT files created by DDG4.
 - An example data file is provided as well in:
 - examples/CLICSiD/compact/CLICSiD_events.root
 - Documentation is lacking a bit....
 - start the display with: `$> root.exe ${DD4hepINSTALL}/examples/DDEve/DDEve.C`
 
 
 * 2014/06/19 Frank Gaede
 - replaced TGeoUnits.h by  DD4hepUnits.h
 - renamed namespace tgeo to dd4hep -> users need to replace tgeo::mm by dd4hep::mm
 
 
 * 2014/06/12 Frank Gaede
 - changed default unit for angles to be radians   (tgeo::rad = 1.)
 - enforce usage of units from TGeoUnits.h in xml expression evaluators
 - convert to degrees for angles in TGeoShapes constructors
 - NB: there is one inconsistency left here:  angles returned
   from TGeoShapes are already in degrees, this is the one
   case where a quantity returned from dd4hep/TGeo does not have the default
   units - thus one should not write
   
  ` double phi = coneSeg.Phi1() / tgeo::rad ;`
  
   but rather
   
   `double phi = coneSeg.Phi1() * tgeo::deg ;`
 
 
 * 2014/06/03 Markus Frank
 - Provision for ROOT persistency for dd4hep detector descriptions:
   Create Cint dictionary for dd4hepCore by default when building the library.
   For the time being the area of DDSegmentation is left out, since these
   objects require changes due to the handling of references and template
   specializations. Besides these, dd4hep detector descriptions can be
   saved and read-back directly to/from ROOT files - which may improve
   a lot the startup time of processes.
 
 - The DDG4 dictionary is created by default when building the library.
   When importing DDG4 from python only the dd4hepCore dd4hepG4 libraries
   must be present. It should no longer be necessary to compile the
   necessary AClick on the fly.
 
 - Investigations on wirframe drawing:
   Wireframes are a property of the scene graph. You can toggle to wireframe
   using the 'w' key on the keyboard. Other representations are 
   'r': Solid view
   't': Solid + wireframe view.
   This information is accessible from the help menu of the ROOT OGL widget.
 
 # v00-07
 * 2014/05/28 Markus Frank
 
 - Several fixes and improvements in DDG4
   - Cache output levels in Geant4Kernel object
   - Add shell handler to measure energy escape e.g. in calorimeters
 - Fix bug in Polycone shapes concerning angles.
       **IMPORTANT: If you forked the repository examples/CLICSiD
       your PolyconeSupport does not work anymore, because the angles
       were given in degrees. They should be given in radians!**
 
 * 2014/05/21 Markus Frank
 - Fix material creation from XML
     JIRA bug: dd4hep -  DDFORHEP-4
     https://sft.its.cern.ch/jira/browse/DDFORHEP-4
     using <composite> in material xml files results in wrong material properties
 
 - Fix JIRA bug: dd4hep -   DDFORHEP-3
     https://sft.its.cern.ch/jira/browse/DDFORHEP-3
    Recursive assemblies result in error in TGeo geometry
     Bug results in errors when closing the geometry like:
     "Error in <TGeoVoxelFinder::SortAll>: Wrong bounding box for volume SIT_assembly"
 
 - Provision to store survey constants to the DetElement as an extension
     for Alignment calculations (priv. comm. C.Parkes)
 
 - Fix bug in expression evaluation of angles.
     All detector constructors receive angles in "rad". No correction 
     from degree to rad should be necessary.
 
 * 2014/05/21 Frank Gaede
 - add MaterialManager class providing
   - access to materials at any point or on straight
     line between two points
   - creation of material with averaged properties (A,Z,rho,x0,Lambda)
  
 - added utility print_materials to print material properties along  
   a straight line between two points including integrated radiation and 
   interaction lengths (useful for debugging geometries and materials)
  
 - use avaeraged material for Surfaces where the thickness extends
   beyond the volume boundaries
    - introduced new simple data class MaterialData for this       
     
 
 - known issues
    - materials don't work for detectors with assemblies in assemblies
         as the TGeo navigation dose not seem to work:
         Error in <TGeoVoxelFinder::SortAll>: Wrong bounding box for volume SIT_assembly
         -> ROOT bug or feature ?
 
     - using <composite/> in compound materials results in incorrect material properties
        see ILDExDet/compact/materials Polysterene as example
 
 
 * 2014/05/06 Frank Gaede
 - DDSurfaces/DDRec:
   - added ICylinder and CylinderSurface to provide
     access to cylinder radius for the tracking
 - teveDisplay: 
   - draw sensitive surfaces in red and helper surfaces in gray
   - protect against missing lcio input file
   - reduced printout from VolumeManager  (changed INFO to DEBUG)
 
 * 2014/04/05-2014/04/29 Frank Gaede
 - Implementation of Surface classes for track reconstruction
   - abstract interfaces in DDSurface:  ISurface and IMaterial  
   - implementation in DDRec:  Surface, SurfaceManager, DetectorSurfaces
   - basic functionality exists:
   - meassurement surface vectors u,v, normal and origin
   - check if point is inside the bounds of the corresponding volume
   - currently the material is taken to be the one from the volume 
       -> to do: average material if surface thicknesses extend beyond the
                 volume for comound materials
   - added drawing of surfaces and (Sim)TrackerHits and (Sim)CalorimeterHits to teveDisplay
      ( link lcio file to teve_infile.slcio )
   - added some surfaces to ILDExDet: VXD, SIT, TPC
   - added test_surfaces to ILDExSimu
      (fails currently for some hits that are not created on the surface ...)
   - added some assemblies to ILDExDet to better structure the geometry hierarchy   
 
 * 2014/04/28  Markus Frank
 - First attempt to understand fully the handling of recursive assemblies
      from the 2014/04/25 was apparently with limited success. Now they should
      work!
 
 * 2014/04/25  Markus Frank
 - Moved boost::spirit parsers to DDCore, since these parsers are also used
      in other packages such as DDCond and DDAlign - whenever strings have to be
      converted to objects.
      Consequently, the boost spirit code fragments were removed from DDG4.
 - Improved and more correct type checking when assigning handles
 - Explicit implementation of the object extension mechanism to be used 
      through inheritance or aggregation rather than having seperate and nearly
      identical implementations for various objects.
 - Improved defintition of basic objects describing Conditions and Alignment.
 - Improved implementation of DDAlign, the alignment support.
      Not to be used currently - experimental package.
 - Initial implementation of DDCond the package supporting the handling of 
      conditions.
      Not to be used currently - experimental package.
 - Geant4Converter: I convinced myself, that the bug in handling assemblies
      of assemblies is resolved. To be tested though.
 
 * 2014/02/07  Frank Gaede
 - added DDGear, support for interfacing to gear for backward compatibility
   - lives currently in ILDExDet ( should become (optional) part of core dd4hep)
   - users need to GearParameter objects as extensions to the DetElement
        -> see ILDExTPC_geo.cpp, ILDExVXD_geo.cpp, ILDExTPCSIT_geo.cpp as examples
   - program convertToGear creates gear xml file from compact file 
        ( only if  GearParameter objects are avialble as extensions)
   - added test_convert_ild_gear 
 - fixed  geometry in ILDExVXD_geo.cpp, ILDExTPCSIT_geo.cpp
      wrt. to position of support ans sensitive ladders
 
 # v00-06   
 * 2014/02/04  Frank Gaede
 - fixed environment scripts thisdd4hep.sh and this${PackageName}.sh
     to also export library pathes for external libraries (CLHEP, LCIO, gear)
 
 - added some simple tests to ILDExDet, ILDExSimu and noviceN04
   - provide cmake script run_test_package.sh ( configured as run_test_${PackageName} ) 
       to call test binaries after initializing the environment
       (needed for automated/nightly tests)
 
 - updated Readme.txt wrt build procedure and running the tests
 
 
 * 2014/01/17    Markus Frank
 - Prepare implementation of Alignment using Release and Grap features of TGeoVolume
     and TGeoNode. In principle this was done in a backwards compatible way, but 
     I cannot really check 100% the #ifdef's.
 - Fix handling of XML collections using XercesC.
     (Bug reported by P.Kostka).
 - Fix several compiler warnings issued by Coverity.
 
 * 2013/12/17    Markus Frank
 - Whole load of fixes to keep coverity quiet....
 - Fix bug in DDG4 field interface component
 - Allow the usage of units, positions and lorentzvectors and in DDG4 properties.
     Example using a position property (ROOT::Math::XYZVector):
     Idle> /ddg4/Gun/position (1*mm,1*cm,0.01*m) 
     Geant4UIMessenger: +++ Gun> Setting property value position = (1*mm,1*cm,0.01*m)  
                        native:( 1 , 10 , 10 ).
 
 - Support for std::vector<T>/std::list<T>/std::set<T> properties.
 
   - Support for include directives of the format
 ```
         <include ref="file-name"/>
     for the top level <lccdd> tags
        Parent tag    Included root tag  Data content
     -- <lccdd>       <define>           See below.
                      <detectors>
                      <detector>
                      <display>
                      <lccdd>            Nested includes (with DTD validation for Xerces-C)
     -- <define>      <define>           Set of constants
     -- <detectors>   <detector>         Single XML subdetector description
     -- <detectors>   <detectors>        Multiple XML subdetector descriptions
     -- <display>     <display>          Set ov visualization attributes
 
     DTD validation is only performed using Xerces-C for root tags <lccdd>.
 ```
 - Note: 
     `<lccdd>` include directives are executed BEFORE any other directive!
     Other include directives are executed BEFORE the corresponding named directive!
 
 * 2013/11/14    Markus Frank
 - Reformat files in DDCode and DDG4 to remove the <TAB>s from the source files.
     Hopefully the content is now more readable.
 - DDCore: Remove empty and named constructors for shapes. Empty constructors
     were simply a dangerous hook to memory leaks, named constructors are 
     deprecated since along time.
 - DDG4: add support for messengers to access and modify properties from
     the Geant4 prompt. For the test hit classes and the simple sensitive 
     detector a ROOT I/O plugin was provided.
 - DDG4: Split into several libraries:
   - libDDG4.so pure    link library without any plugins
   - libDDG4Legacy.so   'Old' plugins. The old stuff at some point
                                will have to disappear.
   - libDDG4Plugins.so  New framework plugins
   - libDDG4LCIO.so     LCIO output plugin for new framework
 
 * 2013/11/03    Markus Frank
 - doc: Add CHEP2013 paper about dd4hep as a start of the documentation 
     section. More to come hopefully.
 - DDCore: several small improvements:
   - Segmentations are no longer Ref_t's.
   - Base internal implementing object directly on the segmentations 
       classes from Christian.
   - Rearrangement of some code from Handle.h to Primitives.h
   - Allow to attach extensions to Detector
 - DDG4: Fix Frank's simulation problem, which he caused himself
     introducing his famous factories....
 - DDG4: First attempt to fix simulation problem with mignetic field.
     Ready for testing.
 - DDG4: First commit of a independent simulation aimed for LHCb and LHeC
     + other newcomers. Documentation needs to be written.
     Features:
   - Modular setup of all Geant4 action routines as plugins, including the
       Run-, event-, tracking-, stacking-, stepping- and generator-actions 
       as well as the physics lists with particle and physics constructors.
   - Setup is possible in XML or with C++ either as an AClick in root or
       standalone. Python based starter to come.
   - Missing is a modular description of the G4 UI and VIS manager(s).
   - Documentation is to come. Before documentation is not present
       the usage is discouraged.
     Note:
   - This version of DDG4 uses boost::spirit. It will compile without
       the BOOST include files and the old functionality is preserved, 
       but it will not work.
       To use BOOST add to the cmake statement the following tags:
       cmake <regular tags> \
       -DDD4HEP_USE_BOOST=ON \
       -DBOOST_INCLUDE_DIR=${BOOST_INCLUDE_DIR}  ....
       Where BOOST_INCLUDE_DIR should point to the boost header directory.
       BOOST libraries are not used.
 
 * 2013/10/18    Markus Frank
 - Throw exception if the expression evaluator sees a problem.
     The message printed before was often not seen.
 - Improve printout on exceptions and plugin abortion
 - Remove the typedef RotationZYX -> Rotation and
     import the type RotationZYX from ROOT::Math.
 
 - Add more explicit error messages in case a plugin is not found.
 - Add file TGeoUnits.h, which allows to use the "usual SystemOfUnits"
     from CLHEP using TGeo with the namespace tgeo::xxx
 ```
     Example: tgeo::mm -> 0.1 (Geant3: cm, sec,  GeV, degree)
                  ::mm -> 1.0 (Geant4: mm, nsec, MeV, radian)
     I hope I got all translations right.
     Geant4                                   Geant3
     ----------------------------------------------------------------
     millimeter         mm=1,cm=10            centimeter  mm=0.1,cm=1
     nanosecond         s=1e9                 second      ns=1e-9,s=1
     Mega electron Volt GeV=1e3               GeV         GeV=1
     radian             rad=1                 degree      rad=180/pi
 
     Unclear to me was if in Geant3 steradian is also 2*2*pi or 2*2*180 degree.
 ```
 
 
 * F. Gaede
 - changes to build system:
          (see ReadMe.txt for details)
 
 - moved examples to ./example directory   
 - they are not built as part of dd4hep anymore
 
 - install thisdd4hep.sh in ./bin
            (modified to have the correct pathes) 
 
 - added -DINSTALL_DOC=on/off option
            to build doxygen documentation (in ./doc/html/index.html)
 
 - create DD4hepConfig.cmake for easy building against dd4hep
            ( see examples CMakeLists.txt)
 
 - fixed doxygen API documentation (C.Rosemann)
           (greatly improved with many graphs)
 
 # v00-04
 * F. Gaede
 - placement options are now compatible with geant4 
 - fixed Geant4SensitiveDetector::getVolumeID()
 - modified ILDEx model to not use assemblies (for now !?)
 - removed obsolete geant4 example ILDEx
 - Fix population procedure of volume manager
 - Fix uniqueness of volume identifiers.
 - Remove call with lookups by placed volume to the volume manager
 - improved ILDEx toy example:                   
   - fixed creation of cellIDS for simhits
   - creates SimTrackerHits for VXD, SIT and TPC
     - creates SimCalorimeterHits for AHcal barrele and endcap
     - works now wigth ILDExSimu _and_ SLIC if no assemblies are used
     - assemblies work with the dd4hep Geant4Converter and VolumeManager
   - added a prototype example for a ROOT independent 
               plugin mechanism for SensitiveDetectors
   - added example implemetation for Calice test beam
           calorimeters: CaliceTbeam  (Shaojun Lu, DESY)
 
 
 * 2013/21/06    Markus Frank
 - Since the placement model for combined translations and rotations
       caused more confusion than good, it was agreed to move to a more
       Geant4 like placement model using Vectors, Rotations and Transformations
       from ROOT::Math. To place a physical volume only one of these
       is allowed as an argument: either a rotation or a translation
       for simple placements. Combinations may be constructed with Transform3D
       objects allowing more complicated placements.
       The same mechanism was applied for the operations to construct
       boolean solids.
 - The CLICSid Examples were updated according to the changes necessary
       from 1)
 - The Tesla drivers from the ILDExDet example were removed. They are
       not compliant to 1).
 - The G4 package allows now to translate TGeo geometries to Geant4.
       Visual inspection has shown an agreement between the two geometries.
 - The TGeo to Detector/GDML conversion is still buggy. Hence, simulations
       using slic as an engine do not yet work. This is being looked at.
 
    IMPORTANT NOTICE:
    The changes described in above may affect existing detector constructors.
    Unless all problems are solved you should be careful to move to the svn
    head. In any case save your checkout or use the tag v00-03.
 
  
 
 # v00-03
 - broken geometry (for some rotations/translations)
 - 'backup release' before placement options 
    will be reduced
 
 # v00-02
 * 2013/02/06    Markus Frank
 - Simplyfy inheritance for common objects from TNamed.
      Use direct inheritance of Object from TNamed rather than hidden 
      using the Value<a,b> construct.
 - Added physical volume manager to simplyfy the detector element 
      and sensitive detector lookup from a given physical volume.
      This implies: If the volume manager is instantiated, the readout specifiers
      MUST be correct. This is in most xml files NOT the case.
      The "system" field holding the sibdetector-id is MANDATORY!
      Otherwise you will receive messages like this:
 
      Exception:SITCollection: This ID descriptor has no field with the name:CellID0
                while programming VolumeManager. Are your volIDs correct?
 
 - To check the volume identification, add argument -volmgr to geoConverter,
      geoDisplay, etc.
 - To trace possible memory leaks:
      export DD4HEP_TRACE=Yes
      then run you converter etc. At the end a table is displayed with a "leakage"
      column, showing how many objects were not deleted.
 ```
      +----------------------------------------------------------------+
      |   I n s t a n c e   c o u n t e r s   b y    T Y P E I N F O   |
      +----------+---------+-------------------------------------------+
      |   Total  | Leaking |      Type identifier                      |
      +----------+---------+-------------------------------------------+
      |        13|        0|dd4hep::DetElement::Object
      |         3|        0|dd4hep::SensitiveDetector::Object
      |         3|        0|dd4hep::Readout::Object
      |         1|        0|dd4hep::OverlayedField::Object
      |         1|        0|dd4hep::CartesianField::Object
      ....
      Ideally the second column only has "0"s. Instances of 1 may be OK (singletons).
 ```
 - Prenotice:
      As soon as ROOT v 6.00 is out, we will have to use it!
      Andrei kindly agreed to implement a few changes to TGeo, which will make 
      life much easier and the implementation cleaner and less cumbersome.
 
 
 # v00-01
 * 2013/20/03    Markus Frank
 - Finished the compact->description converter
      Extract description information
 ```
       $ > geoConverter -compact2description -input file:<compact-input-xml-file> -output <detector>.description
       $ > <SimDist>/scripts/slic.sh -o output.slcio -g SiD.description -m <geant4-macro>.mac -r 100 
 ```
 
 - Finished the compact->gdml converter
   Full GDML cycle can be tested (deplace <detector> with some meaningful identifier):
   - Extract gdml information
       `$ > geoConverter -compact2gdml -input file:<compact-input-xml-file> -output <detector>.gdml`
   - Extract visualisation hints to csv file
       `$ > geoConverter -compact2vis -input file:<compact-input-xml-file> -output <detector>.vis.csv -ascii`
   - Load GDML into ROOT:
       `$ > root.exe ../doc/gdml_root.C+\(\"<detector>\"\)`
       The macro expects *at least* the <detector>.gdml file. If no visualisation
       information is found, the resulting graphics however is not very nice!
  
 
 * 2013/22/02    Markus Frank
 - Today a decision was taken to remove all _X() and _A() macros 
   accessing static unicode strings. A common macro will be used to
   address both XML elements and XML attributes using the macro _U(...).
   The original usage only created confusion.
   All _X and _A macros were replaced by _U.
 
 - Improve the executables running the plugin mechanism in UtitlityApps.
   They now complain if the plugin was not found.
 
 
 * 2013/21/02    Markus Frank
 - Require strict checks for the existence of xml attributes.
   e.g. default=false for Element::attr<bool>() is no longer an option.
   if the attribute is not present in the element, an exception
   is thrown.
 
 - Slightly change the factory method for creating detector elements.
   Use a more generic pattern do support also more generic XML 
   processing.
 
 * 2013/20/02    Markus Frank
 - Install rootmap mechanism for the usage of plugins.
   It is no longer necessary to have separate programs
   for the various detector models (ILD/SiD).
   One generic display program servest them all.
   ==> Creation of package DDExamples/UtilityApps
   example: $> bin/displayGeo -compact <compact-xml-file>
 
 - This move has another consequence:
   All libraries are build into a common install area:
   the <build directory>/lib.
   All executable binaries are build into a common install area:
   the <build directory>/bin.
 
 - The LD_LIBRARY_PATH and PATH variables as defined in 
   'thisdd4hep.(c)sh' do include these directories
 
 * 2013/20/02    Markus Frank
 - dd4hep release notes. Better start them late than never.
   If you perform significant changes to the dd4hep core,
   plase leave a small notice here.

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