License

Gavel is licensed under AGPL v3 and we vendor crowd_bt which means we need to use AGPL v3 too

I prefer MIT so maybe we should write a Python package (MIT-licensed) for pairwise comparisons, and ask the Gavel team if we can add their Crowd-BT implementation as a plugin to the package. If the Gavel team agrees to allow Crowd-BT to be licensed under MIT in the package, then our problem is solved b/c Gavel can remain AGPL (and simply depend on the new package) while we can stay MIT (and also depend on the new package)