Include difficulty rating in aggregated constructor stats

[revuluri]

As a constructor, I’d love to be able to visualize the difficulty ratings of the puzzles I have posted.

This could either be built in (I envision a histogram of number of puzzles by difficulty bin, and/or a scatter plot of number of solves vs. difficulty) — which could (in the future) lead to an interface where solvers could search by difficulty (not just select based on ski codes and auto-tags). Or it could just be allowing the export of this data (and then it'd be up to the constructor to analyze).

If interested, I can find some examples of what I envision for a visualization (likely using Seaborn, if I am correct that the code would be in python; while I am way less knowledgeable outside the python/numpy/pandas/matplotlib domain, I can Google to find stuff for sure). Thanks much for considering!

[mdirolf]

I'm updating the title to narrow the scope of this issue. Any sort of vilsualization (or even just a download) would depend first on aggregating difficulty ratings into our constructor stats table.