QCD control region selection in BLT

Configuration and code changes for including QCD control region selection in both channels.  I have added an extra tree for each selection.

I have used these (taken from note - correct me if something is wrong)
Electron conversion selection - invert conversion selection, 0 (or 1) b tags
Electron non-isolated selection - relIso > 0.2, 0 (or 1) b tags
Muon non-isolated selection - relIso > 0.3, 0 (or 1) b tags, >= 3 jets