Cache the results of single and compare views of demo notebooks.

[paco-barreras]

We need to specify allowed ranges for these algorithms. A good guide is the aggregated metrics, because past a certain value in the "scale" parameter (dist_trhesh, or roam_dist) they stop having any meaningful effect.

• naming convention for the results, so they are loaded quickly.

Multiples of 1 for the parameters shown. min_pts should only be 2, 3, 4. Error message if out of range

How big is the table of cached results?