Make pearson's fast again
Make pearson's fast again

Closes #2

Laptop showing 0.0231 seconds now, compared to 0.108 previously (for 100 runs). Not as fast a scipy (0.006 secs), but it'll do.

`malaffinity.MALAffinity.comparison` and `malaffinity.MALAffinity.calculate_affinity` need some looking into, to make them faster.

erkghlerngm44/malaffinity