Improve vertex validation plots

[rovere]

Fix computation of duplicate rate plots for GEN quantities.
Improve axis limits for few histograms.
Fix merge plots vs dz to use info from GEN.
Properly reset internal containers between different Input collections.

[cmsbuild]

A new Pull Request was created by @rovere (Marco Rovere) for CMSSW_7_2_X.

Improve vertex validation plots

It involves the following packages:

Validation/RecoVertex

@ojeda, @danduggan, @rovere, @cmsbuild, @nclopezo, @deguio, @Degano can you please review it and eventually sign? Thanks.
@cerati, @venturia, @GiacomoSguazzoni, @VinInn this is something you requested to watch as well.
You can sign-off by replying to this message having '+1' in the first line of your reply.
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[cmsbuild]

+1
Tested at: e61aeeb
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-4850/531/summary.html

[cmsbuild]

Pull request #4850 was updated. @danduggan, @ojeda, @rovere, @deguio can you please check and sign again.

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-4850/531/summary.html

[deguio]

+1
you forgot to mention that you are adding 66 new histograms.. ;)
ciao,
F.

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_7_2_X IBs unless changes (tests are also fine).