WCSim Validation

a8561846a505e5f8e14c5c27670be2a4b3ddc6d8

Pull Request #556: Save all Michel electrons from the muMinusCaptureAtRest process

HKFD_5MeVem_centre_xdir

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