Move multi-variate polynomials to new coercion model

[jdemeyer]

CC: @AndrewAtLarge @tscrim @mwageringel

Component: coercion

Author: Jeroen Demeyer

Branch/Commit: u/jdemeyer/ticket/25558 @ 160624f

Issue created by migration from https://trac.sagemath.org/ticket/25558

[jdemeyer]

Dependencies: #25555

[jdemeyer]

Branch: u/jdemeyer/ticket/25558

[jdemeyer]

Commit: d6b2d6a

[jdemeyer]

New commits:

e1bb9b6	Replace `_coerce_` checks by has_coerce_map_from
d6b2d6a	Move multi-variate polynomials to new coercion model

[jdemeyer]

Changed dependencies from #25555 to #25555, #25563

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. This was a forced push. New commits:

a3559d8	Rename MPolynomialRing_generic -> MPolynomialRing_base
2717d6e	Move multi-variate polynomials to new coercion model

[sagetrac-git]

Changed commit from d6b2d6a to 2717d6e

[sagetrac-git]

Changed commit from 2717d6e to 160624f

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. This was a forced push. New commits:

160624f

Move multi-variate polynomials to new coercion model

[jdemeyer]

Changed dependencies from #25555, #25563 to none

[Etn40ff]

comment:10

In #26741 Jeroen mentioned that he might be too busy to work on this full time.

If the stars align properly I will try to be at "Calcul Mathématique Libre" and I would be happy to work on this there but, as I said, I might need some guidance to do so. Would any of the attendees be willing/able to provide it?