WCSim Validation

6672d5bf083c1847410a3a3dc4cb7a85eeb8cd02

Pull Request #541: fix tyvek modeling

SK_500MeVmum_centre_xdir

Tests
2729.77 sec
wcsimrootevent plot pass
wcsimrootevent2 plot pass
wcsimrootevent_OD plot pass
Geom pass
bad pass
Geometry warnings pass