ocaml/opam-repository — pull request #1923 by AltGr (2014-04-22 10:19:05+00:00)
Title: Turn depopts with constraints into conflicts

See https://github.com/ocaml/opam/pull/1325 : this will avoid lots of warnings
and keep consistency when we merge

Rewrite done using https://github.com/ocaml/opam/pull/1323 's `opam-admin
check` plus some manual checking.