Fix for orbit number = 3564, update of the documentation and other improvements

[venturia]

Code which rely on BX number has been fixed to allow BX number = 3564.
Added the description of several plugins
Updates of the configurations to use conddb v2
Added new histograms to monitor the BX and orbit number differences between SCAL and TCDS

[cmsbuild]

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

Fix for orbit number = 3564, update of the documentation and other improvements

It involves the following packages:

DPGAnalysis/SiStripTools
Validation/RecoVertex

@cmsbuild, @vadler, @danduggan, @deguio, @monttj can you please review it and eventually sign? Thanks.
@makortel, @GiacomoSguazzoni, @rovere, @VinInn, @appeltel, @cerati, @istaslis, @threus, @dgulhan 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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[deguio]

+1

[monttj]

+1

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_7_5_X IBs once checked with relvals in the development release cycle of CMSSW (tests are also fine). This pull request requires discussion in the ORP meeting before it's merged. @davidlange6, @Degano, @smuzaffar

[davidlange6]

+1