Update for GEN infos in 74X or later

[emiglior]

This PR superseeds #10071.
In addition to the previous changes it includes the first round of modifications to fill properly the GEN level infos from pythia8 and NLO Monte Carlo generators.
RECO is not affected.
@maralxplus, @mabarrio This can be of interest for you as well as it affects the format of the trees created by MuScleFit as it includes an event weight useful for NLO MC,

[cmsbuild]

A new Pull Request was created by @emiglior (Ernesto Migliore) for CMSSW_7_4_X.

Update for GEN infos in 74X or later

It involves the following packages:

MuonAnalysis/MomentumScaleCalibration

@cmsbuild, @vadler, @monttj can you please review it and eventually sign? Thanks.
@bellan, @mmusich, @frmeier, @argiro 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.
If you are a L2 or a release manager you can ask for tests by saying 'please test' in the first line of a comment.
@Degano you are the release manager for this.
You can merge this pull request by typing 'merge' in the first line of your comment.

[davidlange6]

what is the 76x and 75x version of this pr?

[emiglior]

@davidlange6 The PR for 75x is #10477
I have not yet prepared the PR for 76x

[monttj]

please test

[cmsbuild]

The tests are being triggered in jenkins.

[cmsbuild]

+1
Tested at: 9a5d1eb
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-10477/6909/summary.html

[monttj]

+1

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_7_4_X IBs once checked with relvals in the development release cycle of CMSSW (tests are also fine). This pull request requires discussion in the ORP meeting before it's merged. @davidlange6, @Degano, @smuzaffar

[davidlange6]

+1