Update DSO catalogs #65
Description
This is unlikely to be done in the near future, so might as well open an issue for it. Celestia's catalogs of galaxies, globular clusters, and open clusters need to be updated at some point. This will require creating new scripts to generate them, and finding sources with all needed data (for galaxies, particularly a source of data from which Axis/Angle parameters can be determined).
A nebula catalog would also be nice, but that would require some major code changes since adding a bunch of nebula models to the default distribution would increase the file size too much.