Galaxia import broken

[LourensVeen]

Describe the bug
from amuse.community.galaxia import BarAndSpirals3D gives an error:

  File "/home/spz/anaconda3/envs/amuse/lib/python3.13/site-packages/amuse/community/galaxia/__init__.py", line 1, in <module>
    from .interface import Galaxia
ImportError: cannot import name 'Galaxia' from 'amuse.community.galaxia.interface' (/home/spz/anaconda3/envs/amuse/lib/python3.13/site-packages/amuse/community/galaxia/interface.py)

Galaxia should be available as BarAndSpirals3D (old name), Barandspirals3D (new standardised casing), and Galaxia, but the latter isn't forwarded by amuse/community/galaxia/interface.py and then the import in __init__.py fails. So that should be added, and the other names should be added to __init__.py.

I used a script to make these forwards for all the codes, and I guess it tripped over the inconsistent naming and I didn't do a good enough job of testing everything.

Thanks @spzwart for reporting.

[LourensVeen]

Also, from amuse_galaxia import BarAndSpirals3D doesn't work, but you can import Galaxia from there.

It looks like the intent is maybe for people to migrate to Galaxia, with BarAndSpirals3D and Barandspirals3D deprecated? So one option is to just tell people to use Galaxia instead, and another is to make sure that all three names can be imported with and without .interface. That sounds like a policy question actually.