ADD config option to use case insensitive sort for checkboxes and dropdown fields

git-svn-id: http://svn.montala.net/svn/resourcespace@6002 c08608d7-6e46-0410-86ca-f2a6f1370df5
FIX failed to commit this file with -r5682

git-svn-id: http://svn.montala.net/svn/resourcespace@6003 c08608d7-6e46-0410-86ca-f2a6f1370df5