Housekeeping changes

- Fix: changed np.zeros() into np.nan*np.empty(), safer for reloading runs.
Small tweak to reloader fitting_experiments

- Fix: reloads the experiment_id and show it.
- Fix: refactor to use save_variables_default()
Misbinding reloader, plot kappa EM now

- Add: Plot kappa of EM Fit (as std dev), instead of just showing the precision.
Generator for Hierarchical code, outputs all responses

- Add: In an effort to refit EM parameters and all, re-run hierarchical characterisation simulations, keeping the responses, using sampling and overall doing things better.
Reloader for Memory Curves varying M and sigma

- Add: Reloader to check memory curves fits for varying M and Sigma. Early results are disappointing… Only some vague parameter fits, far from full working result...
Fisher Info single item refactors and improvements

- Fix: Removed the Samples estimator, useless.
- Add: New reloader that has mixture model fits results. Can now plot kappa instead of the raw precision.