addition of soft electron mva, after fixing #4565 merge conflicts

[slava77]

Change in GsfElectron data format:

• rename old mva variable with mva_e_pi
• add mva_Isolated

This PR just picks what's in #4565 and adds a fix to merge conflict in merging PhysicsTools/SelectorUtils/interface/PFElectronSelector.h
a3409cd is applied on top of CMSSW_7_2_X_2014-07-30-0200
and only PFElectronSelector was touched

[cmsbuild]

A new Pull Request was created by @slava77 (Slava Krutelyov) for CMSSW_7_2_X.

addition of soft electron mva, after fixing #4565 merge conflicts

It involves the following packages:

Configuration/Skimming
DQMOffline/EGamma
DataFormats/EgammaCandidates
DataFormats/ParticleFlowCandidate
PhysicsTools/SelectorUtils
RecoBTag/SoftLepton
RecoEgamma/EgammaElectronAlgos
RecoEgamma/EgammaElectronProducers
RecoEgamma/ElectronIdentification
RecoEgamma/Examples
RecoParticleFlow/PFProducer
Validation/RecoEgamma

@ojeda, @StoyanStoynev, @vlimant, @danduggan, @rovere, @monttj, @cmsbuild, @franzoni, @nclopezo, @deguio, @slava77, @vadler, @Degano, @davidlange6 can you please review it and eventually sign? Thanks.
@ghellwig, @mmarionncern, @lgray, @ferencek, @pvmulder, @richard-cms, @bachtis, @rociovilar this is something you requested to watch as well.
You can sign-off by replying to this message having '+1' in the first line of your reply.
You can reject by replying to this message having '-1' in the first line of your reply.

[deguio]

+1

[cmsbuild]

+1
Tested at: a3409cd
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-4842/522/summary.html

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-4842/522/summary.html

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-4842/534/summary.html