WCSim Validation

ba88020456994b81e2eb0a267eab92db979557c6

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

HKFD_500MeVmum_centre_xdir

Tests
10273.52 sec
wcsimrootevent plot pass
wcsimrootevent2 plot pass
wcsimrootevent_OD plot pass
Geom pass
bad pass
Geometry warnings pass