PrimaryVertex sorter fix and store of the score vector

[arizzi]

This PR fix a bug in the filling of the PV sorter association map and adds the requested feature of storing the score vector (the modified sumpt2)
This is also needed in 74X

@VinInn @gpetruc

[cmsbuild]

A new Pull Request was created by @arizzi for CMSSW_7_5_X.

PrimaryVertex sorter fix and store of the score vector

It involves the following packages:

CommonTools/RecoAlgos

@cmsbuild, @cvuosalo, @nclopezo, @slava77 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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@nclopezo, @ktf you are the release manager for this.
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[slava77]

@cmsbuild please test

[cmsbuild]

The tests are being triggered in jenkins.

[cmsbuild]

+1
Tested at: 729108a
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-8101/3144/summary.html

[slava77]

+1

for #8101 729108a
based on tests done towards approval of #8102

see details in #8102 (comment)
this is the same topic branch as in #8102

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_7_5_X IBs unless changes (tests are also fine). This pull request requires discussion in the ORP meeting before it's merged. @davidlange6, @nclopezo, @ktf, @smuzaffar

[davidlange6]

+1