feature 2761: Pass all kind of messages through session on admin

git-svn-id: http://piwigo.org/svn/trunk@18463 68402e56-0260-453c-a942-63ccdbb3a9ee

include/common.inc.php

@@ -64,6 +64,7 @@ $conf = array();
 $page = array(
   'infos' => array(),
   'errors' => array(),
+  'warnings' => array(),
   );
 $user = array();
 $lang = array();

include/page_messages.php

@@ -24,7 +24,7 @@
 // messages only if no redirection
 if ($template->get_template_vars('page_refresh') === null)
 {
-  foreach (array('errors','infos') as $mode)
+  foreach (array('errors','infos','warnings') as $mode)
   {
     if (isset($_SESSION['page_'.$mode]))
     {