- merge rev 2765,2769 from branch 2.0

* 2765 mysql potential injection paranoia + code compaction in common.inc.php
* 2769 added an image sort order by privacy level (admins only)
* 2769 fix an IE6 display issue with quick search on index page

git-svn-id: http://piwigo.org/svn/trunk@2770 68402e56-0260-453c-a942-63ccdbb3a9ee

include/functions_category.inc.php

@@ -273,7 +273,8 @@ function get_category_preferred_image_orders()
       l10n('Rank'),
       'rank ASC',
       ('categories' == @$page['section'] and !isset($page['flat']) and !isset($page['chronology_field']) )
-      )
+      ),
+    array( l10n('permissions'), 'level DESC', is_admin() )
     ));
 }
 
@@ -522,4 +523,4 @@ LIMIT 1';
   }
 }
 
-?>
+?>