results folder shared with NNPDF

[comane]

the results folder in the conda environment should be the same as the NNPDF one.
This will simplify compatibility with validphys.

NOTE: some of the functions currently look for things in colibri/results

[comane]

Has been partially solved in #317

Still needed: chi2 logs in nnfit / replicas folders. This is needed for postfit.