XSNOed-dev Update

Changed the dependencies of xsnoed-dev to be in line with rat-dev ... i.e. rat-dev, rattools-dev, and the correct version of Geant4.

@pgjones Would it be worth changing the XSNOed version numbers to coincide with the RAT version numbers they work with?  I.e. at the moment, XSNOed 5.02 and 5.10 both use RAT 4.5.0, which is a bit confusing if you don't know where to look in order to find that out.