WCSim Validation

fbae23f6ef761bbb2e6a1f327adfc6cdb1e929a1

Pull Request #558: separate tyvek reflectivities

IWCD_500MeVem_centre_xdir

Tests
2502.21 sec
wcsimrootevent plot pass
wcsimrootevent2 plot pass
wcsimrootevent_OD plot pass
Geom pass
bad pass
Geometry warnings pass