ATLAS and CMS W/Charm
This PR contains the data for the following experiments:
- CMS W+charm rapidity differential distributions, 13 TeV (NLO)
- ATLAS W+charm rapidity differential distributions, 7 TeV (NLO).
The necessary buildmaster (nnpdf/buildmaster#135 and nnpdf/buildmaster#82), external (NNPDF/external#56), applgrids (NNPDF/applgrids#30) and apfelcomb (NNPDF/apfelcomb#68) PRs have already been merged in the corresponding repos. #675 has been updated accordingly.