- use propagatedBuildInputs to make sure ocaml plugin stuff is in path
- updated coqPackage.heq (broken url)
- fixed use of `DESTDIR` and `COQMF_COQLIB` in mkCoqDerivation
- adding `COQCORELIB` environement variable to put ocaml plugin files in the right place
- make metaFetch available from `coqPackages`
- fixed bignum version
- fixed coq-bits version
- fixed coqprime version
- fixed mathcomp and mathcomp extra packages
(reworked building scheme and removed unused ssreflect directory)
- giving the user access to function filterCoqPackages, because overrideScope' does not re-apply it.
Cyril Cohen