Calculate correct best suggestions instead of heuristic

[derwiki]

The current scoring mechanism has a percentage threshold that must be exceeded by (intersections / set_a_members_length) for the result to be scored. This is really not fair to all sets (large ones in particular). A more fair solution would be to calculate the results for every comparison, and keep the best scoring. My guess is that this would take a bit longer than the current version, but the results would be much better.