- This is the first packages which uses Dune in order to build and install
so I had to refactor build-support/coq/default.nix in order to support it.
- I added a new feature: one can now release.v.sha256 empty to try to download
with a fake sha256, hence failures are reported and one can copy paste the
sha256 given by the error message.
- I updated the documentation of languages-frameworks/coq.section.md accordingly.
