rebase of https://github.com/inugent/cmssw/tree/RelVal_Gen_13TeV/ from 7_0_X to 7_2_X
clean up commented code
Update GGToHtautau_13TeV_pythia8_Tauola_taurhonu_cff.py
Merge pull request #4696 from inugent/RelVal_13TeV_7_2_X

Configuration -- Rel val 13 te v 7 2 x