increase likelihood of yielding thread
Add --depth argument to cli import
Add depth integration tests
merge develop -D org: PR 2127 (Working view to email announcements to selected users, groups, email addresses and/or all users)
merge develop -D org: PR 2391 (Imagej omero (rebased onto develop))
merge develop -D org: PR 2435 (cpp: RTypesI: use static locals in place of duplicated globals)
merge develop -D org: PR 2550 (Avoid upscaling of bird's eye image)
merge develop -D org: PR 2560 (for-loop fix removes 'undefined' from reset dialog. See #12301)
merge develop -D org: PR 2612 (Add wsgi.py for OMERO.web (develop))
merge develop -D org: PR 2624 (nginx config template improvement)
merge develop -D org: PR 2686 (clear sessions)
merge develop -D org: PR 2691 (Tag import (rebased onto develop))
merge develop -D org: PR 2722 (Preview size (rebased onto develop))
merge develop -D org: PR 2727 (Exposure time (rebased onto develop))
merge develop -D org: PR 2728 (Reset default name (rebased onto develop))
merge develop -D org: PR 2730 (Redistribute launch scripts in Linux and Mac client zips (rebased onto develop))
merge develop -D org: PR 2731 (Remove test subcommand from CLI web plugin)
merge develop -D org: PR 2732 (Show file paths (rebased onto develop))
merge develop -D org: PR 2733 (make sleep timer's shutdown method less likely to hold thread (rebased from dev_5_0))
merge develop -D org: PR 2735 (Add --depth argument to cli import (rebased onto develop))