WCSim Validation

c87d2dfa2006375368c17989131d00c0cefec569

Pull Request #557: Feature/individual pmt dark rate

IWCD_500MeVem_centre_xdir

Tests
2415.67 sec
wcsimrootevent plot pass
wcsimrootevent2 plot pass
wcsimrootevent_OD plot pass
Geom pass
bad pass
Geometry warnings pass