WCSim Validation

c3b6156cdf1ca43132a8e3bd38bbbb7feb57c60b

Pull Request #557: Feature/individual pmt dark rate

SK_500MeVem_centre_xdir

Tests
3227.73 sec
wcsimrootevent plot pass
wcsimrootevent2 plot pass
wcsimrootevent_OD plot pass
Geom pass
bad pass
Geometry warnings pass