Improve security of sessions:

- use only cookies to store session id on client side
- use default php session system with database handler to store sessions on server side

git-svn-id: http://piwigo.org/svn/trunk@1004 68402e56-0260-453c-a942-63ccdbb3a9ee

admin/group_perm.php

@@ -140,11 +140,9 @@ $template->assign_vars(
     'L_CAT_OPTIONS_INFO'=>$lang['permuser_info'],
     
     'F_ACTION' =>
-      add_session_id(
         PHPWG_ROOT_PATH.
         'admin.php?page=group_perm&group_id='.
         $page['group']
-        )
     )
   );