2014.07.18 MSS Code Factory 1.11.12271 LogIn and LogOut request messages coded

The X(ml)Msg requests RqstLogIn and RqstLogOut have been defined
and their handlers coded and wired to the schema parser.

The server side pieces of the equation for log in and log out are
in place as well, so the next piece I have to work on is coding
the response handlers and getting them wired to their schema parser.

The GUI will need to be enhanced such that Login is only enabled
if no authentication object exists, and Logout is only enabled
if an authentication object *does* exist.  I'll need to implement
a custom dispose() for the desktop as well that logs out if an
authentication object exists before it invokes the super.dispose().