- put back config['session_length'] disappeared in r1493 but has always been

used in the code (generates mysql errors on session garbage collector)
- fix auto_login (die mysql when session timed out, but user has remember)
- when a user reconnects from identification.php, the remember cookie was not
deleted
- fix all redirect warnings/errors (many changes - mainly in common.inc.php
and user.inc.php)
- reduced $conf['remember_me_length'] to 60 days, because now at each auto 
login the 60 days countdown restarts

git-svn-id: http://piwigo.org/svn/trunk@1568 68402e56-0260-453c-a942-63ccdbb3a9ee

identification.php

@@ -72,10 +72,7 @@ SELECT '.$conf['user_fields']['id'].' AS id,
     array_push( $errors, $lang['invalid_pwd'] );
   }
 }
-elseif (!empty($_COOKIE[$conf['remember_me_name']]))
-{
-  auto_login();
-}
+
 //----------------------------------------------------- template initialization
 //
 // Start output of page