Finally pushed as a41bca08e27da0d4db176c8fadf21e278af4a2b6 -
4d390cad2510797a68f473db347699e748c92e42.

Sorry for taking so long! I've removed ocaml-parsetree-migrate because
it was already present in guix. I've also slightly modified the
descriptions (adding a dot or making the first sentence a full sentence
in some packages). Otherwise, they were very good, thank you!