Where I'm updating code that's already in the repository, I'm primarily fixing floating point overflow errors and deleting trailing whitespace at the end of lines.
The new code at the end of the pull request is the momentum-based feedback prescription.
It should be possible to use this feedback prescription in the AGORA test problem that's already in the repository by turning on the appropriate feedback algorithm. That said, this feedback prescription has been tested at 20 pc resolution and not the 80 pc resolution test problem. I'm happy to make suitable parameter files available if anyone wants to try running one of these simulations.