Backport from 7_6_X: ttbar event categorizer, miniAOD jet flavour improvements

[bartosik-hep]

Backport of PRs from CMSSW_7_6_X: 10564, 11081

• Protected JetFlavour tool against missing jet constituents in miniAOD. No crashes any more.
• Switched off jet reclustering in the test configuration of GenHFHadronMatcher in miniAOD.
  • Excluded neutrinos from reclustered jets in AOD to match the ones in miniAOD.
• Added an improved version of the custom ttbar-categorisation producer provided in the TWiki, based on the GenHFHadronMatcher tool.
  • Allows to separate between different tt+jets subprocesss with a single integer number: tt+bb, tt+cc, tt+2b, tt+2c, tt+light jet, etc.
  • Supports all decay channels of the ttbar system.
  • To be used by Top and ttH analyses.

[cmsbuild]

A new Pull Request was created by @bartosik-desy (Nazar Bartosik) for CMSSW_7_4_X.

Backport from 7_6_X: ttbar event categorizer, miniAOD jet flavour improvements

It involves the following packages:

PhysicsTools/JetMCAlgos
TopQuarkAnalysis/TopTools

@cmsbuild, @vadler, @monttj can you please review it and eventually sign? Thanks.
@ferencek, @acaudron, @pvmulder, @kreczko, @imarches this is something you requested to watch as well.
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@Degano you are the release manager for this.
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