WCSim Validation

53321dc5bddcf3c4a683258dc8ce21a93907d2ec

Pull Request #558: separate tyvek reflectivities

SK_5MeVem_centre_xdir

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