WIP Merging
Created by: scarlehoff
Dummy branch to merge the latest changes to a single branch and run tests before merging to master.
Reopening this branch with a change in the concurrency rules as I just realized that parallel branches had the same ref
Fitbot for the python part: https://github.com/NNPDF/nnpdf/pull/1913#issuecomment-1900458761
Rules to merge the other 2 PR: https://github.com/NNPDF/nnpdf/pull/1913#issuecomment-1900337107