WCSim Validation

ca2f61ad5627e5b1fe868bd771e8ac4f278b8bf1

Pull Request #560: Standardise sampling method for li sources

IWCD_500MeVem_centre_xdir

Tests
2802.49 sec
wcsimrootevent plot pass
wcsimrootevent2 plot pass
wcsimrootevent_OD plot pass
Geom pass
bad pass
Geometry warnings pass