Clean up UniqueRepresentations in sage.algebra (part 1)

[embray]

Motivated by this comment, this removes some needless explicit __eq__ and __ne__ implementations from some classes in sage.algebras that subclass (directly or indirectly) UniqueRepresentation.

This also fixes problems with these classes on Python w.r.t. #24551. There are likely other cases like this but I'm just looking one top-level sub-package at a time...

Component: algebra

Author: Erik Bray

Branch/Commit: bc9af5f

Reviewer: Frédéric Chapoton

Issue created by migration from https://trac.sagemath.org/ticket/25387

[fchapoton]

Reviewer: Frédéric Chapoton

[fchapoton]

comment:2

ok

[fchapoton]

comment:3

Very high priority should be given to handling the hash problem in sage/manifold.

Because issues there create a lot of errors in doc-building :

https://patchbot.sagemath.org/log/0/Ubuntu/18.04/x86_64/4.15.0-20-generic/petitbonum/2018-05-17%2015:22:17?plugin=docbuild

[embray]

comment:4

I have temporary fixes to most of those in my python3 branch. But I'd like to take another look if any of those fall into a similar category as this ticket.

[vbraun]

Changed branch from u/embray/misc/unique-repr/algebras-1 to bc9af5f