WCSim Validation

77e939fb63102d0410ebcaf935bf145c61b2ee3a

Pull Request #543: assign correct thicknesses to FDOD WLS plates

SK_500MeVem_centre_xdir

Tests
3210.78 sec
wcsimrootevent plot pass
wcsimrootevent2 plot pass
wcsimrootevent_OD plot pass
Geom pass
bad pass
Geometry warnings pass