Puppi and SoftKiller cloning input candidates when they are of PF type

[ferencek]

Puppi and SoftKiller producers now clone the input candidates if they are of PF type in order to keep things like track Refs, etc. This will enable subjet b tagging for Puppi and SoftKiller jets.

@rappoccio @nhanvtran @violatingcp

[cmsbuild]

A new Pull Request was created by @ferencek (Dinko Ferencek) for CMSSW_7_4_X.

Puppi and SoftKiller cloning input candidates when they are of PF type

It involves the following packages:

CommonTools/PileupAlgos

@nclopezo, @cvuosalo, @monttj, @cmsbuild, @slava77, @vadler can you please review it and eventually sign? Thanks.
@ahinzmann, @jdolen, @rappoccio this is something you requested to watch as well.
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[slava77]

@cmsbuild please test

[cmsbuild]

The tests are being triggered in jenkins.

[cmsbuild]

+1
Tested at: d8a72b5
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-8576/2415/summary.html

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-8576/2415/summary.html

[cvuosalo]

+1

For #8576 d8a72b5

Added cloning of PF candidates for Puppi and SoftKiller jets so more information is retained in the PF candidates. This change is in preparation to allow b tagging of subjets but does not change, in itself, processing or output quantities.

The code changes are satisfactory, and Jenkins tests against baseline CMSSW_7_4_X_2015-03-27-2300 show no significant differences, as expected.