Really, really logout (fixes r2467).

svncommit

2009-05-12 f22c2cefb4c7f8b1a995d5de6f706d49861c473c

 program/include/rcmail.php

@@ -793,6 +793,8 @@
   */
  public function kill_session()
  {
    foreach (array_keys($_SESSION) as $var)
      rcube_sess_unset($var);
    $_SESSION = array('language' => $this->user->language, 'auth_time' => time(), 'temp' => true);
    rcmail::setcookie('sessauth', '-del-', time() - 60);
    $this->user->reset();