Multicore OCaml: November 2021 with results of code review

I don’t want to build a scheduler and write bindings for all the libraries I need to make them work with that home-grown scheduler… If eio decides to make automatic balancing of fibers to cores, that would be unfortunate, but as long as that gives me all the libraries at a distance of opam install, I would live with that (and enjoy sporadic thread races)…

Looks like we’re getting closer and closer to bikeshedding territory.