MET PAT tool update + update of MET significance

[cmsbuild]

This PR contains the following changes :

• fix several tiny bugs in the MET tool (e.g. JECs were not properly propagated when only reapplied on slimmed jets, met significance set to zero arbitrary in the wrong constructor)
• revisits the jet smearing code
• enable the jet smearing and its propagation to the MET
• revisits the MET unclustered energy uncertainties with detector based resolution instead of the ad-hoc 10%
• uniformize the jet selection for Type1MET correction and MET JES uncertainties
• enable the use of DB JER numbers for teh MET significance and jet smearing
• fix the scheduled mode of the PAT MET tool

======= /!\ IMPORTANT NOTICE /!\ =========

Jet energy resolution values are now available in the database, but not yet stored in it. and those values are used in the jet smearing and in the met significance computation. In the lack of GT containing a JetResolutionRcd entry, all tests (runTheMatrix or standard tests) involving a PAT process will fail if it touches the MET tool.

Packages involved :

• DataFormats/METReco
• DataFormats/PatCandidates
• JetMETCorrections/Modules
• JetMETCorrections/Type1MET
• PhysicsTools/PatAlgos
• PhysicsTools/PatUtils
• RecoMET/METAlgorithms
• RecoMET/METProducers

Changes expected :

• very tiny change in CPU consumption due the MET significance computation
• MET significance is now computed in the central pat::MET
• tiny change expected in the slimmedMET/ patPFMetType1 pT values due to the uniformization of cleaning (removal of overlaps selected/slimmed muons and electrons)
• unclustered uncertainties changed
• smeared MET not set to the central value anymore
• JER uncertainties accessible if someone uses the smeared MET
  Automatically ported from CMSSW_8_0_X MET PAT tool update + update of MET significance #13115 (original by @cms-met).

[cmsbuild]

+1
Tested at: 0abee9a
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-13372/11807/summary.html

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-13372/11807/summary.html

[cmsbuild]

Pull request #13372 was updated. @cvuosalo, @monttj, @cmsbuild, @slava77, @vadler, @davidlange6 can you please check and sign again.

[slava77]

@cmsbuild please test

[cmsbuild]

The tests are being triggered in jenkins.
https://cmssdt.cern.ch/jenkins/job/ib-any-integration/11812/console

[cmsbuild]

+1
Tested at: 1f1c606
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-13372/11812/summary.html

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-13372/11812/summary.html

[slava77]

+1

for #13372 1f1c606

• changes in the code are in line with the description and more details provided in MET PAT tool update + update of MET significance #13115
  • this is the same topic branch as MET PAT tool update + update of MET significance #13115
• jenkins test pass and comparisons with baseline show differences in puppi-related jet and MET variables, consistent with changes observed in MET PAT tool update + update of MET significance #13115.