add essential files for test
add test code for corrections for caloMET
add test code for corrections for pfMET
add two tests (commented out now)
add testInputFiles_cff.py (all lines commented out now)
fix a bug
restore class definition using PF information
Implement and use the new interface of RecoCaloTools/Selectors.

MetaCollections are no longer used (replaced with edm::SortedCollection),
additionally users can pass a callback function/lambda to a selector and avoid building a collection altogether.
Make FastSimulation not dependant on MetaCollections.
Make DQMOffline/Trigger not dependant on MetaCollections.
TauAnalysis/MCEmbeddingTools/CaloRecHitMixer no longer requires EcalRecHit to inherit from CaloRecHit.
RecoJets/JetProducers/JetMatchingTools no longer requires EcalRecHit to inherit from CaloRecHit.

The JetMatchingTools now use struct with {detid, energy} instead of a pointer to *RecHit.
RecoLocalCalo/CaloTowersCreator/CaloTowersCreationAlgo no longer requires EcalRecHit to inherit from CaloRecHit.
EgammaCoreTools now uses EcalRecHit.checkFlag() instead of the deprecreted recoFlag().
Calibration/HcalCalibAlgos/GammaJetAnalysis no longer requires EcalRecHit to inherit from CaloRecHit.
Removal of MetaCollections and switching to a new EcalRecHit (no inheritance from CaloRecHit).
initial implementatin of new DT object for storing Reco Uncertinties in the DB
initial implementatin of new DT object for storing Reco Uncertinties in the DB
test
add the possibility to dump uncertainty DB