FIX broken link to wiki and reordered themes for new slim design


git-svn-id: http://svn.resourcespace.org/svn/resourcespace@6082 c08608d7-6e46-0410-86ca-f2a6f1370df5
FIX Edit content page refresh resulting in blank page for no apparent reason.


git-svn-id: http://svn.resourcespace.org/svn/resourcespace@6083 c08608d7-6e46-0410-86ca-f2a6f1370df5
FIX previews not being generated when user group had $metadata_read = FALSE;
Also, extension is supposed to be the needle, not the haystack


git-svn-id: http://svn.resourcespace.org/svn/resourcespace@6084 c08608d7-6e46-0410-86ca-f2a6f1370df5