Removed HiggsExtensionModel.h and moved the corresponding definitions to NPbase. Now modified Higgs models should inherit from NPbase.
Merge with GitHub
Merge branch 'RevisedInterfaces' of https://github.com/silvest/SusyFit into RevisedInterfaces

Conflicts:
	HiggsExtensions/src/HiggsKvKf.h
	HiggsExtensions/src/HiggsThObservables.h
	StandardModel/src/StandardModel.cpp
	StandardModel/src/StandardModel.h