Add L1 prescales to the miniAOD

[gpetruc]

Add L1 prescales to the miniAOD

Uses the extended method to get the prescales of the individual L1 bits if there are multiple of them, and saves the maximum and minimum non-zero prescale value.
In the most common cases it should either be l1min = 1 (the path is seeded by at least one unprescaled L1) or l1min = l1max (the path has a single L1 bit, or multiple but all with the same prescale), and this PR should cover them.
Other cases require anyway the user to delve deeper into how the path is seeded, and this can be done following the instructions on https://twiki.cern.ch/twiki/bin/view/CMSPublic/SWGuideHighLevelTrigger#L1T_and_HLT_Prescales_for_HLT_pa (runs on MiniAOD, but requires the full framework, correct global tag, etc.)

Will prepare 75X and 76X versions later today or monday

[cmsbuild]

A new Pull Request was created by @gpetruc (Giovanni Petrucciani) for CMSSW_7_4_X.

Add L1 prescales to the miniAOD

It involves the following packages:

PhysicsTools/PatAlgos

@cmsbuild, @vadler, @monttj can you please review it and eventually sign? Thanks.
@rappoccio, @imarches, @ahinzmann, @acaudron, @mmarionncern, @jdolen, @nhanvtran, @schoef, @ferencek, @mariadalfonso, @pvmulder, @TaiSakuma 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.

[monttj]

please test

[cmsbuild]

The tests are being triggered in jenkins.

[cmsbuild]

+1
Tested at: 0857940
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-10895/7705/summary.html

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-10895/7705/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