Add RA2 code for skimming and all HH analysis activities (status at publication of SUS-13-012)

This is the status at publication time of SUS-13-012 when the code was moved from CVS
to this github repository. The code was run in CMSSW_5_3_5. It contains all information
necessary to
- create the RA2 PAT skims
- create the ntuples for data and MC control plots, tail scans etc.
- predict the QCD and Lost-Lepton backgrounds
- produce the final data-vs-MC plots

[matsch@nafhh-cms02:~/CMSSW_5_3_5/src]% showtags
Test Release based on: CMSSW_5_3_5
Base Release in: /afs/naf.desy.de/group/cms/sw/slc5_amd64_gcc462/cms/cmssw/CMSSW_5_3_5
Your Test release in: /afs/desy.de/user/m/matsch/CMSSW_5_3_5
--- Tag ---    -------- Package --------
V00-03-23      CommonTools/RecoAlgos
V00-00-13      CommonTools/RecoUtils
NoCVS          DAS/DASTreeMaker
V00-11-17      DPGAnalysis/SiStripTools
V01-00-11-01   DPGAnalysis/Skims
V06-05-06-03   DataFormats/PatCandidates
V00-02-14      DataFormats/StdDictionaries
V00-00-08      DataFormats/TrackerCommon
CutBasedId_V00-00-05 EGamma/EGammaAnalysisTools
V00-04-01      ElectroWeakAnalysis/Utilities
V04-06-09      JetMETCorrections/Type1MET
V00-12-06      PhysicsTools/Configuration
V08-09-42      PhysicsTools/PatAlgos
V08-01-02      PhysicsTools/Utilities
NoTag          RA2Classic/AdditionalInputFiles
NoTag          RA2Classic/LostLeptonBkg
NoTag          RA2Classic/MCResolutions
NoTag          RA2Classic/QCDBkgRS
NoTag          RA2Classic/ResultProcessor
NoTag          RA2Classic/SUSYParams
NoTag          RA2Classic/Skimming
NoTag          RA2Classic/TreeMaker
NoTag          RA2Classic/Trigger
NoTag          RA2Classic/Utils
NoTag          RA2Classic/WeightProducer
V01-09-05      RecoLocalTracker/SubCollectionProducers
V04-01-09      RecoLuminosity/LumiDB
V00-00-08      RecoMET/METAnalyzers
V00-00-13      RecoMET/METFilters
V15-02-06      RecoParticleFlow/PFProducer
V14-00-07      RecoParticleFlow/PFRootEvent
RA253XAN_20Dec2012V2 SandBox/Skims
RA2_2012-12-30 SusyAnalysis/AnalysisUtils
V04JAN2012_v1  UserCode/DataFormats
NoTag          UserCode/HistoWeightProducer
NoTag          UserCode/MyCompositeProducers
NoTag          UserCode/RA2IsrFsr
---------------------------------------
total packages: 37 (37 displayed)

Additional remarks:
- RA2Classic has no sticky tag but corresponds essentially to the
  tag `RA2-2013-07-19-MoveToGitHub' of UserCode/kheine/RA2Classic.
  There are a few local modifications, e.g. the skimming configs or
  plotting styles, that are (probably) not important. Anyways, they
  are in this repository now.
- SandBox/Skims originated in UserCode/seema. This version contains
  the HONoiseFilter-related files, i.e. .h, .cc, _cfi.py, that are
  not in the CVS tag cited above.
- SandBox/Skims/RA2Cleaning_cff.py has important local modifications
  wrt the CVS tag that correctly switch the Tracking-POG filters to
  `tag mode'.Add RA2 code for skimming and all HH analysis activities (status at publication of SUS-13-012)
add info on CVS-to-github migration