WCSim Validation

3c59f8e8bd8253bceacc4ed688c19749be6a9d5c

Pull Request #518: Update IWCD ID mPMTs and OD layout

SK_500MeVem_centre_xdir

Tests
3314.68 sec
wcsimrootevent plot pass
wcsimrootevent2 plot pass
wcsimrootevent_OD plot pass
Geom pass
bad pass
Geometry warnings pass