The actual name of the package is type_conv
(https://github.com/janestreet/type_conv). Having it named
ocaml_typeconv adds a verbosity that isn't required and actually makes
the package harder to find.
OCaml Oasis is a configure/build/install system for OCaml proget (like
Cabal for Haskell).
This commit also add a few small dependencies that where missing
- OCaml Data Notation (odn)
- ocamlify
- ocamlmod
