WCSim Validation

ce0028843938befdaa27d8d8e5cd930a9f46e554

Pull Request #520: Update LI code, better sampling

SK_500MeVem_centre_xdir

Tests
3235.10 sec
wcsimrootevent plot pass
wcsimrootevent2 plot pass
wcsimrootevent_OD plot pass
Geom pass
bad pass
Geometry warnings pass