Add HZZ4l spin-0 property pdfs
extern
change the order of loading snapshot and setPhysicsParameters
add "skipBOnlyFit" for MaxLikelihoodFit to just make a s+b fit only.
Giovanni's piece of code for edit nuisances
setting correctly the mean and sigma for input nuisances
correct the meps model
adding "--en-file", "--edit-nuisances-from-file"  option for combineCards.py
Merge branch 'development' of https://github.com/cms-analysis/HiggsAnalysis-CombinedLimit into NoOptimizeCachingNLL_ForRooExponentialWithMoreParameters

Conflicts:
	interface/MaxLikelihoodFit.h
	python/DatacardParser.py
	python/VEVandEpsilon.py
	scripts/combineCards.py
add C8 (for BRUndet), CWidth, 2HDM models
cleanup
Merge branch 'development' of https://github.com/cms-analysis/HiggsAnalysis-CombinedLimit into NoOptimizeCachingNLL_ForRooExponentialWithMoreParameters

Conflicts:
	python/DatacardParser.py
fixing bugs/typos in NuisanceModifier
add "--en-file" to allow extral txt file as input for nuisance modification
Fix hgluglu scaling
Cleanup
Cleanup
Cleanup
Cleanup verbosity
Merge pull request #141 from chenmingshui/mschen

Reviewed with @chenmingshui