Adding Pt-Y variations for VBF process.
Same number of nuisances as before (should be fixed for the QCD scale in the datacard)
just that now the effect on VBF is also calculated
Merge pull request #370 from nucleosynthesis/nckw-add-vbf-pdf-Y-uncertainties

Adding Pt-Y variations for VBF process.
Just a little aesthetics
More explanation
Merge pull request #372 from matthewkenzie/signal_model_explain

More explanation
Merge pull request #371 from matthewkenzie/matt_being_an_idiot_again

Just a little aesthetics