Allow re-authentication with OpenID

"Rememberme" logins aren't allowed to make changes to an account
(since cookie-stealing is too easy). Users have to re-authenticate.
Previously, it was impossible to do so without having a username and
password; this change lets you do it with OpenID, too.

classes/User.php

@@ -630,4 +630,15 @@ class User extends Memcached_DataObject
 
         return $profile;
     }
+
+    function hasOpenID()
+    {
+        $oid = new User_openid();
+
+        $oid->user_id = $this->id;
+
+        $cnt = $oid->find();
+
+        return ($cnt > 0);
+    }
 }