Create the XMPP accounts of a new client.
 - Renamed the field 'tokenId' of the Client entity to 'code'.
 - Use the name 'ASBox' to reference in the GUI the remote agent.
XMPP addresses generated by the Grid Operator.
 - The Client does not generate the XMPP addresses anymore.
 - The RESTful services updated in order for they do not transfer the XMPP addresses.
 - The XMPP accounts are deleted from the server when the Client is deleted from the application.
 - The XMPP addresses cannot be updated.