WCSim Validation

c3f88439206d1bc91a4e45c3884801948c545d27

Pull Request #512: Working build with optional hepmc3

IWCD_5MeVem_centre_xdir

Tests
166.83 sec
wcsimrootevent plot pass
wcsimrootevent2 plot pass
wcsimrootevent_OD plot pass
Geom pass
bad pass
Geometry warnings pass