Add an `arc_[archive-id]` CSS class to all news list items (see #4998)
Show the release notes when installing or upgrading an extension (see #5058)
Allow to alter any button set via the "buttons_callback" (see #4691)
Correctly handle empty databases in `Database::listTables()` (see #6222)
Move the "edit multiple" selection buttons to their own DCA category (see #4691)
Allow to set the proxy server domain in the back end settings (see #4615)
The form generator now supports defining a minimum input length (see #4394)