Omero-py

Bug Fix

- Fix OMERO.tables to work with all column types
[288](https://github.com/ome/omero-py/pull/288)
- Fix race condition in OMERO.tables
[292](https://github.com/ome/omero-py/pull/292)
- Fix Python2-ism in omero.gateway findExperimenters method,
thanks to [Alex Herbert](https://github.com/aherbert)
[293](https://github.com/ome/omero-py/pull/293)

New CLI option
- Add `--retry [RETRIES]` to `omero login` [283](https://github.com/ome/omero-py/pull/283)

Bug Fix
- remove usage of deprecated method preventing usage on Python 3.9 [282](https://github.com/ome/omero-py/pull/282)
- CLI: obj update strips newlines [279](https://github.com/ome/omero-py/pull/279)
- roi_utils: fix possible division by zero [278](https://github.com/ome/omero-py/pull/278)

Other updates
- download provider uses NamedTemporaryFile [274](https://github.com/ome/omero-py/pull/274)

- Admin: introduce `omero.server.nodedescriptors` configuration property
for configuring services launched on start-up
[272](https://github.com/ome/omero-py/pull/272)

Bug fix

- CLI: fix `omero errors` command under Python 3 [264](https://github.com/ome/omero-py/pull/264)

Bug fix

- CLI: fail login when user input is required but stdout is not connected to
a tty(-like) device [256](https://github.com/ome/omero-py/pull/256)

Other updates

- Import test: check stderr for output [260](https://github.com/ome/omero-py/pull/260)
- Switch from Travis CI to GitHub actions ([261](https://github.com/ome/omero-py/pull/261), [#262](https://github.com/ome/omero-py/pull/262))