add yield prediction for all SR
New file to compute 2nd lepton in acceptance + protect with #ifndef
Adding changes from Eric and Caro these last two weeks
Adding protection against header multiple inclusions
Adding leadingNonBPt definition for C&C + inverted loose/tight definition for BDT T2bw_050
Manually merged changes, moved background predictions to backgroundPredictions.h and backgroundPredictions_withGenSyst.h (and consistently swapped T2bw050_1_loose and T2bw050_1_tight
Merging with Michael - moved the new prediction stuff to backgroundPredictions.h