Remove dynesty from __getstate__

This came from an external request to make our Dynesty object picklable. Here the external_sampler (which is the dynesty module) is stored in the object and can't be pickled by pickle.

There may be other neater fixes, if people have thoughts, let me know.

changed milestone to %0.5.2

approved this merge request

approved this merge request

merged

mentioned in commit 0ccf55c7