Fix triangulation ring off-by-one error

[Theelx]

Overview: What does this pull request change?

Motivation and Explanation: Why and how do your changes improve the library?

These changes fix a bug that I encountered with OpenGL rendering for certain scenes. However, the bug did cause rendering to error when its conditions were met, so I figured it should be fixed upstream instead of in a local fork.

Links to added or changed documentation pages

I'm not sure if there are any documentation pages that need to be changed, but I'm open to being corrected!

Further Information and Comments

While the diff for utils/space_ops.py shows 6 lines added, the only real change was changing the bit saying j < ring[-1] to j <= ring[-1]. The rest of the changes in that file are a comment plus formatting.

Reviewer Checklist

• The PR title is descriptive enough for the changelog, and the PR is labeled correctly
• If applicable: newly added non-private functions and classes have a docstring including a short summary and a PARAMETERS section
• If applicable: newly added functions and classes are tested