Merged.

Comment for future readers: when deciding on the new file paths in the repository, we wanted to support a planned future repackaging of code, where (once we have a Python interface to the search code) optional components can live inside the fast_downward namespace package, as in:

fast_downward.translate => translator
fast_downward.merge_and_shrink => optional package adding functionality to search
fast_downward.cartesian_abstractions => optional package adding functionality to search

etc.

Large things like the merge-and-shrink code might be further subdivided into subpackages, so perhaps fast_downward.merge_and_shrink should also be a namespace package. We didn't go into the discussion in this level of detail, so this is just to acknowledge the general direction.

Because fast_downward is a namespace package, such optional components can be shipped on PyPI independently of the Fast Downward core.

There was a duplicate issue1220 (now closed) with some earlier discussion.

The PR for the downward-markdown repository is now available at https://github.com/aibasel/downward-markdown/pull/10

We already uploaded a package on PyPI to secure the name but the necessary changes have not yet been integrated in Fast Downward. The corresponding changes are now ready for review: https://github.com/aibasel/downward/pull/306

I still need to prepare a separate pull request in the downward-markdown repository to update the release-workflow, but this is independent from this PR.

We decided to make the translator available as an independent package on Pypi. This will be in addition to the usual release, so for the moment, we still plan to include the translator as part of the normal Fast Downward releases.