Grand update of energy scale and smearing systematic uncertainties.

* Updated scale and smearing uncertainties to https://twiki.cern.ch/twiki/bin/view/CMS/HggLegacySystematicUncertainties#Energy_scale
* Added configuration for material systematics
* Split 7 and 8TeV nuisances (requires changes in the signal model scripts)
* Replaced "_extra" suffix with "Phi" for stocastic smearing phi nuisances
Merge pull request #357 from musella/topic_update_systematics

Grand update of energy scale and smearing systematic uncertainties.