/**
  * Log out form handler method
  *
  * This method is called when the user clicks on "logout" on the form
  * created when the parameter <i>$checkCurrentUser</i> of the
  * {@link __construct constructor} was set to TRUE and the user was
  * currently logged in.
  */
 public function logout()
 {
     $s = new Security();
     $s->logout();
 }