Merge pull request #1868 from snoopycrimecop/merge/develop/submodules

Update develop submodules
Correct whitespace.
Remove tabs and space.
Post an event to discard viewer.

Event posted when the re could not be reloaded.
Merge pull request #1885 from joshmoore/10740-plate-imports

Reduce the number of transactions for import (See #10740)
Create new session if failed to join.
handle differently dns for testing.
Fix NPE if no archived returned.
Remove import.
Fix units if value is 0.0
Make sure that we always at least one group available for a user.
Do not allow to download plates
Print out error.
Check that the correct component is visible.
Add DBUserCheck to create a Roles object from the DB (See #11813)

By default the strings "user", "guest", "root", and "system" are
used to look up the IDs. By setting omero.roles.user.guest etc.
in config.xml, other strings can be used, but this is NOT suggested.
Add dbUserCheck to background processes
Use EvaluatorFilter to exclude some DEBUG logging from Blitz.log
Check if the namespace is the tag set ns (see #11382)
Remove tabs and spaces.
Clean up.