Adding capability to write out Ptrs in JetConstituentSelector (Backport of #22092)

[rappoccio]

Backport of #22092.

Summary there:

In order to recluster AK8 jets from MINIAOD (*), we need to write out the jet constituents in a way that can be easily read out. This adds the capability to write out Ptrs and appropriate unpacking of AK8 jets. This should not affect existing workflows. Backports incoming.

(*) This is often needed for JMAR studies. There will also be an upcoming workflow for JMAR development with nanoaod.

[cmsbuild]

A new Pull Request was created by @rappoccio for CMSSW_9_4_X.

It involves the following packages:

CommonTools/RecoAlgos
DataFormats/PatCandidates

@perrotta, @cmsbuild, @monttj, @slava77 can you please review it and eventually sign? Thanks.
@gouskos, @jdolen, @makortel, @abbiendi, @rovere, @ahinzmann, @gkasieczka, @jhgoh, @cbernet, @gpetruc this is something you requested to watch as well.
@davidlange6, @slava77, @fabiocos you are the release manager for this.

cms-bot commands are listed here

[cmsbuild]

Pull request #22093 was updated. @perrotta, @cmsbuild, @monttj, @slava77 can you please check and sign again.

[perrotta]

please test

[cmsbuild]

The tests are being triggered in jenkins.
https://cmssdt.cern.ch/jenkins/job/ib-any-integration/25961/console Started: 2018/02/07 21:50

[cmsbuild]

+1
Tested at: 6f7e590
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-22093/25961/summary.html

[cmsbuild]

Comparison job queued.

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-22093/25961/summary.html

@slava77 comparisons for the following workflows were not done due to missing matrix map:

• /build/cmsbld/jenkins/workspace/compare-root-files-short-matrix/results/JR-comparison/PR-22093/1325.7_TTbar_13_94XNanoAODINPUT+TTbar_13_94XNanoAODINPUT+NANOEDMMC2017+HARVESTNANOAODMC2017

Comparison Summary:

• No significant changes to the logs found
• Reco comparison results: 0 differences found in the comparisons
• DQMHistoTests: Total files compared: 26
• DQMHistoTests: Total histograms compared: 2718773
• DQMHistoTests: Total failures: 109
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 2718502
• DQMHistoTests: Total skipped: 162
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0 KiB( 0 files compared)
• Checked 107 log files, 9 edm output root files, 26 DQM output files

[perrotta]

+1

• Identical to Adding capability to write out Ptrs in JetConstituentSelector #22092
• The capability to write out the subjets constituents is disabled by default (i.e. standard workflows are not affected) but can be enabled for the possible dedicated use cases
• (In particular, reco and miniAOD outputs are not modified)

[fabiocos]

Already integrated in 10_1_0_pre1

[fabiocos]

+1

[fabiocos]

merge