WCSim Validation

49b91b9a3e3b8d697a30d0b26b06f6603f57ec12

Pull Request #547: Fixes photon timing and theta binning.

HKFD_500MeVem_centre_xdir

Tests
12105.32 sec
wcsimrootevent plot pass
wcsimrootevent2 plot pass
wcsimrootevent_OD plot pass
Geom pass
bad pass
Geometry warnings pass