Basically working Groups/Users choosr dialog
Improved css and open/close of groups/users chooser
For Admins show ALL groups after My Groups
Fix css on History and Search pages
Revert search.html changes, using dummy group_user_dropdown
Overflow-y:auto for groups_users menu
Removing empty blocks from css
Groups users menu wider
Merge pull request #2859 from will-moore/rebased/develop/groups_users_menu_12082

Groups users menu 12082 (rebased onto develop)