2014.07.16 MSS Code Factory 1.11.12268 Login window added and hooked in, default frame closes corrected

The default behaviour of the JInternalFrame closings was not set to dispose of the
window instance, so the GUI prototype was leaking memory like a seive, littering
itself with initialized (but hidden) instances of windows.  That has been corrected.

A login window has been laid out and played with, and it's ready to be wired
to the instance methods for performing a login and initializing the security
data.  I'll probably have to add some new APIs and schema messages to deal with
logins.  I won't implement user passwords yet, but soon database passwords will
be getting checked.

The main windows File/Close menu item has been wired to dispose of the main JFrame.
Apparently disposal is the "normal" way of dealing with closing an application
with Swing.  I'd have thought there would be a prepare-to-close protocol that
negotiates possible refusals to close, but I guessed wrong -- only JInternalFrames
have such a protocol.