WCSim Validation

e09048d2dc2851919cec5a1fb1c46e4202694135

Pull Request #541: fix tyvek modeling

IWCD_5MeVem_centre_xdir

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