Release 6.20.0: A new request is introduced to change the client host IP address

[changerequest]

A new action is added to the login servlet. This action is named changeip. This action allows to change the client host IP address stored in the session. Parameters for the request are the session identifier and the new IP address. Further IP checks will be done using the newly provides IP address.

The request is documented in the HTTP API: http://oxpedia.org/index.php?title=HTTP_API#Change_IP