Order dataset differences by name of the commondata

Created by: scarlehoff

This addresses #1858 (closed) in the following ways:

1. Adds a mention to the theories being used at the end of the comparison
2. Adds the name of the commondata (the one we actually use in the runcard) so that it is easier to read for those of us that know the dataset by its runcard name
3. Orders by the setname, this has (or will have) the benefit of automatically implying an order in 1. experiment, 2. process, 3. energy

Example report: https://vp.nnpdf.science/QHB504AaT0WbicohYul0cA==

Let me know if this is what you had in mind @felixhekhorn