WCSim Validation

18230e0d5ef9b5c32234d862585814f2a6e24615

Pull Request #557: Feature/individual pmt dark rate

HKFD_5MeVem_centre_xdir

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