This is so that the Sage library becomes fully functional even when not being run from within sage-env (which sets PATH).

We add sage.features.nauty to provide features for nauty executables.

To test:

$ venv/bin/python3 -c 'from sage.all import graphs; print(len(list(graphs.fullerenes(60))))'

Depends on #31292
Depends on #31296
Depends on #31590

CC: @dcoudert @dimpase

Component: graph theory

Author: Matthias Koeppe

Branch/Commit: 9107e2c

Reviewer: David Coudert

Issue created by migration from https://trac.sagemath.org/ticket/33465