WCSim Validation

826e48fbd5f9a6b4e45d0a26f92955bc861e7405

Pull Request #520: Update LI code, better sampling

HKFD_500MeVem_centre_xdir

Tests
10376.82 sec
wcsimrootevent plot pass
wcsimrootevent2 plot pass
wcsimrootevent_OD plot pass
Geom pass
bad pass
Geometry warnings pass