Enhancement/enhanced polyhedral gravity model

[julsanmer]

• Review: By commit
• Merge strategy: Merge (no squash)

Description

Changed the math to evaluate polyhedron gravity to be more computationally efficient. The key is to initialize and store several variables that are non-related to the evaluation point.

Verification

The polyhedron gravBody unit test succeeds.

Documentation

I've included html documentation for the polyhedron gravity. I think that by proceeding this way, the documentation is more clearer and accessible than with the big pdf on gravityEffector. But open to other thoughts.

Future work

Should the gravity models be stored in specific folders within the gravityEffector folder? It'd feel more organized this way.
As my time allows, I'd try to PR other features that could be of interest to BSK project.

[schaubh]

thanks for the contribution. Please see
https://github.com/AVSLab/basilisk/blob/develop/CONTRIBUTING.md
on the new contributing requirements where we run a precommit script to ensure proper formatting, removing of trailing white spaces, etc. I already fixed the issues and pushed the fix.

The documentation is now also auto-built and tested on the CI server. It had an error with the RST formatting, and because your last section had non content. Could you please add content or remove the last section title?

[schaubh]

I see odd structure in your branch now. Please use rebasing to make a clean branch, not merging. Also, let me know when ready to review again. Please do a rebase on develop before asking for next review to ensure there are no conflicts.

[schaubh]

We have a clean branch now. Please double check that you are still getting the expected functionality.

• address the variable naming issue
• add release notes