fix small bug in shape uncertainty names, now different for btag and nobtag
adding functionality to deal with infinite points in the generated histograms by truncating the function before the infinite point. To be tested. Should allow us to fit some btag 7TeV shapes.
adding the QCD fits for btag 7TeV. These can now get a fit with new functionality to deal with infinite points in histograms
Merge pull request #73 from rcl11/master

Some further updates for tail fitting