Add initialisation for lhe variables
Add HT (lheHT) and Njets (lheNj) parton level information for madgraph samples stitching
PDFweight added for 7TeV->8TeV reweighting. It works only with LHE based geneators. For the others generators and data PDFweight=1.
Started from Ntupler.cc version 1.79. Added ptRaw for additional jets, needed for MET corrections.
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