Modify PI0DALITZ EvtGen model to find out maximum probability at run-time.

Michal Krepsrequested to merge
kreps_etaDalitzllg into Sim09

Modify PI0DALITZ EvtGen model to find out maximum probability at run-time in order to make it useable also for eta decays. The corresponding change in HepForge for the future is at https://phab.hepforge.org/D62.

@tblake, @nsahoo

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