add final covmat regularisation procedure and a stat estimator table
Created by: wilsonmr
added the final recommendation for covmat reg to calcutils, added functions which regularize both covmat and sqrt of covmat (lower triangle/systematics file)
Also added a preliminary table for comparing the affect of different thresholds on the difference between the chi2 and the expected chi2 in units of the standard deviation of the chi2.
To do:
-
improve table -
potentially add more tables -
check documentation, I copied a lot of the code from https://github.com/NNPDF/nnpdf/tree/regfrol2 so it might be wrong
closes #584 (closed)