v4.4.0 for CMSSW 8.0.X

Changed

• Full list of changes with respect to v4.3.0+80X: v4.3.0+80X...v4.4.0+80X
• yet another round of protection for pdf weights
• store hdamp variation for POWHEG samples
• split pdf weights per initial state
• Moriond17 b-tagging scale factors for cMVAv2
• Electrons SFs for Moriond17
• Preliminary EGM scale and smearings
• JER from text files
• New Rochester corrections
• Abitility to split JEC into subcomponents

Postponed

• CMSSW - version bump would be for next round (incoming when new EGM prescriptions available)