merge -c2900 from trunk to branch 2.0.

- Bug fixed: username or password with accented character are now accepted for upgrade.
- Simplify query in  pwg_session_write function.
- Retrieve data with cURL method in fetchRemote function now work with forwarded URL.

git-svn-id: http://piwigo.org/svn/branches/2.0@2901 68402e56-0260-453c-a942-63ccdbb3a9ee

include/functions_session.inc.php

@@ -131,18 +131,7 @@ SELECT data
 function pwg_session_write($session_id, $data)
 {
   $query = '
-UPDATE '.SESSIONS_TABLE.'
-  SET expiration = now(),
-  data = \''.$data.'\'
-  WHERE id = \''.get_remote_addr_session_hash().$session_id.'\'
-;';
-  pwg_query($query);
-  if ( mysql_affected_rows()>0 )
-  {
-    return true;
-  }
-  $query = '
-INSERT INTO '.SESSIONS_TABLE.'
+REPLACE INTO '.SESSIONS_TABLE.'
   (id,data,expiration)
   VALUES(\''.get_remote_addr_session_hash().$session_id.'\',\''.$data.'\',now())
 ;';