Upgrade to Dose release 3.2.2

Closes #1411, #1417
Merge pull request #1445 from OCamlPro/dose-322

Upgrade to Dose release 3.2.2
Add a custom opam-admin toplevel to ease mechanised rewrites of repos

See shell/depopts_to_conflicts.ml and shell/remove_notequals.ml for examples.
src_ext: build bytecode too