add graphic cue to collapsible sections

git-svn-id: http://svn.montala.net/svn/resourcespace@4541 c08608d7-6e46-0410-86ca-f2a6f1370df5
do not show all collections in search bar when search in collections is not allowed in config

git-svn-id: http://svn.montala.net/svn/resourcespace@4542 c08608d7-6e46-0410-86ca-f2a6f1370df5