Added a bacterial ferritin dataset. Sigma2 for this dataset ends up around 0.25, which is interestingly very similar to the gradient of the line observed for this familiy (a.25.1.1) in the Illergard et al. paper, which was 0.233 (although their line is the proportionality of RMSD to evolutionary distance, which should presumably be equivalent to sigma rather than sigma2, so this similarity is likely to be coincidental). In any case the most interesting point is that sigma2 here is lower than for the globins.
Revert "Moving scripts directory to other repo."

This reverts commit c42667baa10691c2047da9a38b7dd532abc421b6.
Moving scripts and test data to other repo.