stub out moments
repair (by brute force) the algs  from my chol() mistake.

the ks tests now agree where before they didn't! so satisfying.

mathematics.tex is still in error!
attempt to make the density plots more legible

- more histogram bins (for some reason, some hists still only show 2 or 3 bins; maybe those ones just have such an extremely tight middle but wide total range that the binning isn't behaving nicely?)
- colour and dash the overlaid pdf
KS legibility: print the p value on failure to see how extreme the failure was and title the whole lot
Only bother testing the upper triangle