fix #11687: removeGroups can take unloaded experimenters
use local convenience method
Set the enabled flag to false when saving data.
Modify handling of admin results.
Review retrieval of node associated to a context.
Do not collapse the nodes.
Add null check for browser when in search mode (see #11611)
Fix context issue.
Fix flake8 output for CLI basics plugin
Fix flake8 output for CLI admin plugin
Fix flake8 output for CLI cecog plugin
Fix flake8 output for CLI chgrp plugin

Conflicts:
	components/tools/OmeroPy/src/omero/plugins/chgrp.py
Fix flake8 output for CLI db plugin
Fix flake8 output for CLI group plugin
Fix flake8 output for CLI export plugin
Fix flake8 output for CLI hql plugin
Fix flake8 output for CLI delete plugin

Conflicts:
	components/tools/OmeroPy/src/omero/plugins/delete.py
Fix flake8 output for CLI download plugin
Fix flake8 output for CLI import plugin

Conflicts:
	components/tools/OmeroPy/src/omero/plugins/import.py
Fix flake8 output for CLI prefs plugin