merge master -Dorg -Ssuccess-only

Repository: ome/omero-py
Excluded PRs:
  - PR 184 manics 'Auto-format code with black' (exclude comment)
  - PR 160 manics 'prefs.py: config throw if OMERODIR not set' (exclude comment)
  - PR 129 dominikl 'Add option to create new ThumbnailStore connection' (exclude comment)
  - PR 115 manics 'Remove omero_ext.argparse' (exclude comment)
Already up-to-date.

Merged PRs:
  - PR 194 manics 'Support Python 3 asyncio concurrency'
  - PR 199 joshmoore 'user: allow setting default group'
  - PR 207 manics 'BlitzGateway.connect raise on error'
  - PR 266 joshmoore 'errors: use raise_error from cli plugins'
  - PR 290 glyg 'Assert connection decorator, see ome#289'
  - PR 299 joshmoore 'Add parents and children to omero obj'

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