WCSim Validation

3c1c6b7ed8d1652b428af7aeeb3653df8f1ab885

Pull Request #520: Update LI code, better sampling

SK_500MeVem_centre_xdir

Tests
3323.10 sec
wcsimrootevent plot pass
wcsimrootevent2 plot pass
wcsimrootevent_OD plot pass
Geom pass
bad pass
Geometry warnings pass