WCSim Validation

207591f30c3ffdcb3fe6014b34a57c912b8f8332

Pull Request #560: Standardise sampling method for li sources

SK_500MeVem_centre_xdir

Tests
1855.54 sec
wcsimrootevent plot pass
wcsimrootevent2 plot pass
wcsimrootevent_OD plot pass
Geom pass
bad pass
Geometry warnings pass