Rust

[scemama]

Now, the rust interface finds the trexio.h file on the system and extracts the JSON from it. It avoids downloading and compiling a trexio special for rust.

[q-posev]

Do we need the trexio.h in our git tree if the goal of this PR is to discover it at build time on the user machine?

[scemama]

The problem is that a trexio.h file needs to be found to build the rust code. If the code can't be built, the documentation can't be built either.
On the doc.rs website (which hosts the documentation of all rust crates), all the files needed to build the code have to be in the repo. So I added this file as a fallback to be able to build the documentation. Otherwise, the documentation on doc.rs is empty, but the users can build it locally.
It still doesn't work though, because I need to make tests on a machine where trexio is not installed....
Do you know how I could generate the documentation on doc.rs easily?

[q-posev]

@scemama No, sorry, my Rust is still at the very basics. Is there a way to tell doc.rs to go and download the release tarball from Github before building the documentation? We have trexio.h there..