New PU reweighting, QCD control region study, and other little things

My new changes include the new nominal data PU distribution contained in TauAnalyzer.cc (I added the distribution root file just for good measure), new scripts for the nonIsoW QCD control region study, additions to formatPlots.C that calculate/use the MC background-subtracted versions of Regions C and D for the high MT bin, and some other minor edits