Record postfit parameters in postfit folder
Created by: voisey
Closes https://github.com/NNPDF/nnpdf/issues/527
Writes chi2 and arclength thresholds to a json file within the postfit folder
Created by: voisey
Closes https://github.com/NNPDF/nnpdf/issues/527
Writes chi2 and arclength thresholds to a json file within the postfit folder