Caching EM fitting for Experimental data

- Added: now caches the results of fitting the Mixture model into files. Was getting annoying when running reloader_* scripts. Should perhaps improve to make a checksum comparison (if code to load experimental data changes…).
New runs for Memory curve hierarchical

- Added: new generator, samples other part of the space.
- Fix: reloader uses this new generator now
Reloader Misbinding plot EM fits

- Added: EM fits to the misbinding data. Not fantastic for now, seems like there's a bug in em_circularmixture, it doesn't use the best LL found.