merge master -Dnone -Ihotfix -Ssuccess-only

Repository: ome/omero-py
Excluded PRs:
  - PR 299 joshmoore 'Add parents and children to omero obj' (user: joshmoore)
  - PR 290 glyg 'Assert connection decorator, see ome#289' (user: glyg)
  - PR 266 joshmoore 'errors: use raise_error from cli plugins' (user: joshmoore)
  - PR 207 manics 'BlitzGateway.connect raise on error' (user: manics)
  - PR 199 joshmoore 'user: allow setting default group' (user: joshmoore)
  - PR 194 manics 'Support Python 3 asyncio concurrency' (user: manics)
  - PR 184 manics 'Auto-format code with black' (user: manics)
  - PR 160 manics 'prefs.py: config throw if OMERODIR not set' (user: manics)
  - PR 129 dominikl 'Add option to create new ThumbnailStore connection' (user: dominikl)
  - PR 115 manics 'Remove omero_ext.argparse' (user: manics)
Already up-to-date.

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