Adding archive copy of blog post menagerie.html
Adding derivation(s) of dependent from non-dependent W-types.
Renaming to w-to-inductive.v to make use of builtin equality explicit.
Starting on fetooling of w-to-inductive.v without rewrite; ack, it’s painful.
Minor correction to previous commit.
Committing changes that were over a very old version of upstream, for later re-basing.