feature #379, multiple format, no browser cache

No need random string in URL to avoid browser cache, coding tip by @modus75

picture.php

@@ -677,7 +677,7 @@ SELECT *
       foreach ($formats as &$format)
       {
         $format['download_url'] = 'action.php?format='.$format['format_id'];
-        $format['download_url'].= '&download='.substr(md5(time()), 0, 6); // a random string to avoid browser cache
+        $format['download_url'].= '&download';
         
         $format['label'] = strtoupper($format['ext']);
         $lang_key = 'format '.strtoupper($format['ext']);