WCSim Validation

c8de76c5e2dfc3e11efe5b5842ce7aaeeb8b6790

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

IWCD_500MeVem_centre_xdir

Tests
2611.71 sec
wcsimrootevent plot pass
wcsimrootevent2 plot pass
wcsimrootevent_OD plot pass
Geom pass
bad pass
Geometry warnings pass