Tweaks to drag-handles, ovoid overlap of scrollbar
merge develop -D org: PR 2240 (Search image id 12151)
merge develop -D org: PR 2256 (Tablet drag handling)
merge develop -D org: PR 2258 (Truncate js tree dynamically 12161)
merge develop -D org: PR 2268 (Remove last file annotation)
merge develop -D org: PR 2269 (ROI improvements)
merge develop -D org: PR 2270 (Disk space 12126)
merge develop -D org: PR 2304 (Remove group during import (rebased onto develop))
merge develop -D org: PR 2305 (Birdeyeview bugs)
merge develop -D org: PR 2308 (remove erroneous bitsize update)
merge develop -D org: PR 2311 (Fix for 11674 - script doc links (rebased onto develop))
merge develop -D org: PR 2318 (OMERO.matlab: add argument to retrieve annotation by owner (rebased onto develop))
merge develop -D org: PR 2325 (Added pythonpath to omero admin diagnostics.)
merge develop -D org: PR 2326 (Adding contributing docs (rebased onto develop))
merge develop -D org: PR 2327 (CLI download improvements (rebased onto develop))
merge develop -D org: PR 2328 (Change CLI naming options (rebased))
merge develop -D org: PR 2329 (Passes channel configuration to Make_Movie (see #12036) (rebased onto develop))
merge develop -D org: PR 2331 (Flake8 cleanup on omeroweb/webstart)
merge develop -D org: PR 2335 (Remove settings (rebased onto develop))
merge develop -D org: PR 2336 (New tagging dialog)