make FsFile constructor more permissive
use Deque in CheckedPath
use Deque in FleetingDirectory
add curly braces
remove whitespace
update copyright headers
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 2411 (Update develop submodules)
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 2715 (Don't swallow error on startup (rebased onto develop))
merge develop -D org: PR 2717 (remove some empty CSS clutter)
merge develop -D org: PR 2722 (Preview size (rebased onto develop))
merge develop -D org: PR 2723 (minor Deque tidy-up (rebased from dev_5_0))