Add luminosity plots to comparefits template
Created by: voisey
Closes https://github.com/NNPDF/nnpdf/issues/1131
A few comments:
- I only include normalised plots because I don't think absolute plots are very instructive
- I've chosen to normalise to the reference fit, which seems intuitive to me. This is not what's done for the PDF plots however (https://github.com/NNPDF/nnpdf/blob/master/validphys2/src/validphys/comparefittemplates/comparecard.yaml#L51) which I'd like to change. Do you agree that this makes more sense?
- I have been selective with the choice of channels because @Zaharid says these plots are relatively expensive and I don't want to clog up the report too much. The channels I've missed out are: ssbar, ccbar, bbar, scbar, csbar, pp and pg. Do you think it's worth including these for completeness?