Migrated PhotonAnalyzer to new DQM framework
Migrated PiZeroAnalyzer to new DQM framework
Migrated ZToMuMuGammaAnalyzer to new DQM framework
Removed the histograms that only contained the counts of the other histograms
Modified the structure so that all the parameters are initialized in the constructor and the dedicated booking function only contains actual booking
Revert "Removed the histograms that only contained the counts of the other histograms"

This reverts commit 8ef425693abd7a23c4e538b9d70b5508674e5725.
Revert "Validation code for BTagging at HLT"
Merge pull request #6303 from cms-sw/revert-5904-btag-hlt

Revert "Validation code for BTagging at HLT"
Merge pull request #6053 from vanbesien/migration_of_DQM_to_thread_safe_part_02

 Migration of a bunch of validation modules to the new DQM interfaces (3)
Merge remote branch 'origin/CMSSW_7_3_X' into CMSSW_7_0_X