Fixes to primary vertex validation

[makortel]

This PR has the following fixes to primary vertex validation

• Fill also the "not reconstructed" bin of TruePVLocationIndexCumulative histogram
• Fix the definition of "mistag" (now "signal PV is reconstructed, but is not the first one in the vertex collection")

In addition, add a recipe for running the validation without RECO using the 2-file solutions to the README.

Tested in 740pre6.

@rovere @VinInn

[cmsbuild]

A new Pull Request was created by @makortel (Matti Kortelainen) for CMSSW_7_4_X.

Fixes to primary vertex validation

It involves the following packages:

Validation/RecoVertex

@cmsbuild, @danduggan, @nclopezo, @deguio can you please review it and eventually sign? Thanks.
@GiacomoSguazzoni, @rovere, @VinInn, @appeltel, @cerati, @dgulhan, @venturia this is something you requested to watch as well.
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[cmsbuild]

+1
Tested at: 2984c94
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-7756/2642/summary.html

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-7756/2642/summary.html

[deguio]

+1

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_7_4_X IBs unless changes (tests are also fine). This pull request requires discussion in the ORP meeting before it's merged. @davidlange6, @Degano, @ktf, @smuzaffar

[davidlange6]

+1