Atlas 1 jet 8 TeV

This PR contains the implementation of the ATLAS inclusive jet data at 8 TeV (no NNLO K-factors so far). A data/theory comparison is available for:

• R=0.4 https://vp.nnpdf.science/ajl2JFjXRnGokuM7U4hX8w==
• R=0.6 https://vp.nnpdf.science/_pWHVSOySsCBs_sXc5Uy7A==