8TeV measurement changes

- added a bunch of new control plots for 8 TeV (including all the variables under study)
- fixed a small bug in 7 TeV script (forgotten #)
- the 8 TeV cross section configuration file was updated
- new binning for all variables at 8TeV
- new latex label for WPT
- treating the empty QCD templates which sometimes happens
- updated the ufloat instances according to the new uncertainties package
- other minor updates