Bump MathComp version to >= 1.12.0

[pi8027]

This PR makes apery compatible with MathComp 1.12.0 and later. It also cleans up proof scripts as preliminary work for #4. This PR itself does not add any extra dependency or enhance the proof automation facility.

Closes #2

[pi8027]

coq-community/coqeal#38 and coq/opam#1714 should fix the CI failure with coq.dev.

[pi8027]

Waiting for a fix on multinomials. https://github.com/math-comp/apery/pull/3/checks?check_run_id=3786055714

[pi8027]

It seems that math-comp/math-comp#766 made hanson.v diverging🤦‍♂️

[CohenCyril]

@pi8027 FYI, I started the CI again to test the to be released version of mathcomp

[pi8027]

I think this PR is ready. Shall we merge so that we can test apery in MathComp CI? @amahboubi

[CohenCyril]

The CI failure is spurious (and should eventually be solved by math-comp/multinomials#53 and a release AFAIU).
@amahboubi do you have time to review this? Do you want someone else to review it?

[pi8027]

CI green.

[amahboubi]

Many thanks @pi8027 for this amazing work. I do not have time for reviewing such a PR right away, but I am of course fine with a review by someone else, or even with a merge after minimal checks.

[CohenCyril]

@amahboubi

Many thanks @pi8027 for this amazing work. I do not have time for reviewing such a PR right away, but I am of course fine with a review by someone else, or even with a merge after minimal checks.

I did a minimal check, and I approve.

[amahboubi]

Thanks a lot!

[pi8027]

Thanks!