Update: use dune instead of oasis
Remove a lot of warnings (considered as errors by dune). Split the lutin opam package into several ones: - lutin - ezdl - gbddml Also, I've merge the content of lutin-utils into lutin. Note that this opam "package split/ocaml library merge" move is somewhat imposed by the fact that dune impose the use of one opam package per library (if I got it correctly). But as a matter of fact, merging lutin and lutin-utils libs makes sense. Having standalone ezdl and gbddml opam packages too.