WCSim Validation

dcf681e84d207263a0dcb806bcbc132dc1bc52b4

Pull Request #501: Update IWCD OD PMT positions

SK_500MeVem_centre_xdir

Tests
3266.36 sec
wcsimrootevent plot pass
wcsimrootevent2 plot pass
wcsimrootevent_OD plot pass
Geom pass
bad pass
Geometry warnings pass