Changes for 7_2_x:
- switched to cutbased PUJetID algo due to TMVA XML compatibility issues
- updated ElectronProducer to new GsfTrack data format
- updated usage of ClusterTools
- updated instructions
Disable energy regression
Merge remote-tracking branch 'musella/topic_72x_porting_rebase'

Conflicts:
	MicroAODProducers/plugins/PhotonProducer.cc
update instructions slightly