Initial version of a slimmed and simple vertex validator
Avoid unneeded branching and fix an offset-by-one while filling the mistag plot
Improve code, remove unused private member, put Simulated PV computation and histogram filling out of the reco loop and fix TruePVIndex plot.
Add standalone harvesting sequence that could be used to run only VertexValidation harvesting easily.
Add small README file to run the Vertex Validation package in standalone mode
minor fix to the documentation
Improve plots, duplicate plots for GEN quantities
Add python file to physically produce png plots out of the final ROOT file
Improve ranges of couple of histograms
Fix more english typos
Make destination folder configurable to ease the usage @HLT
Move back from DQMEDAnalyzer to the old interface emd::EDAnalyzer
Turn off MET significance calculation in CaloMETs

The previous pull request: https://github.com/cms-sw/cmssw/pull/4838
might cause potential problem in future. As suggested by Tai, we
can just turn off MET significance calculation in CaloMETs.
Also add EcalHitsEK to subdets, so that pileup is digitised
pixel aging at  300 / 500 fb-1 updated
Put histograms in a common folder shared by other vertex-related validation packages
Don't draw assebies.
Suppress misleading TGeoManager messages at startup.
Port changes from 7_1_X branch.
L1 upgrade e/g: Add parameter to choose type of H/E cut