WCSim Validation

4b3d2535ffec2b6b26948c9ca613fce93e99da2b

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

IWCDOD_500MeVem_centre_xdir

Tests
3078.42 sec
Failed wcsimrootevent plot comparisons
Failed wcsimrootevent2 plot comparisons
Failed wcsimrootevent_OD plot comparisons
Geom
bad pass
Geometry warnings pass