Support renaming of Functor (define _repr_(), not __repr__())

[pjbruin]

The class Functor and some of its subclasses define a __repr__() method which doesn't support renaming:

sage: F=IdentityFunctor(Rings())
sage: F
The identity functor on Category of rings
sage: F.rename('I')
sage: F
The identity functor on Category of rings

This ticket moves these methods to _repr_() so the standard SageObject.__repr__() is used, which makes renaming work at least for Python classes.

Component: categories

Keywords: repr renaming

Author: Peter Bruin

Branch/Commit: 4866cae

Reviewer: Jan Keitel

Issue created by migration from https://trac.sagemath.org/ticket/16156

[pjbruin]

Commit: 6bc7e6c

[pjbruin]

Branch: u/pbruin/16156-Functor_repr

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. New commits:

4866cae

typographical fixes

[sagetrac-git]

Changed commit from 6bc7e6c to 4866cae

[sagetrac-jkeitel]

comment:3

Hi, looks simple & good, so I'll put it to positive review.

[sagetrac-jkeitel]

Reviewer: Jan Keitel

[vbraun]

Changed branch from u/pbruin/16156-Functor_repr to 4866cae