Example of the external decayer implementation with PYTHIA6
 The complete PYTHIA6 documentation can be found at:
 home.thep.lu.se/~torbjorn/pythiaaux/recent.html">http://home.thep.lu.se/~torbjorn/pythiaaux/recent.html
 The PYTHIA6 external decayer was originally developed within 
 the AliRoot framework, by Andreas Morsch (CERN).
 The dependence on the ALICE software was taken off
 by Christian Holm Christensen,
 The dependence on the Root framework and the integration in 
 the Geant4 framework was done by Ivana Hrivnacova (IPN Orsay).
 
SEE ALSO: README