Split-pane the main window for happy drag-resizing

-- Moved a little stuff out of Main->new into a new ->Initialize
-- Remove 'testtest' that was feebing up the first thing sent to the
connection
-- Starting using Class::Accessor::Fast where appropriate
-- Added a prefs ->save if you close normally.  Not optimal.
-- all-new Window::MainSplitter class that holds the input/output frames
-- Window::Main: moved menu stuff from new into its own build_menu method
-- OutputPane now has ScrollIfAppropriate to handle resize etc.  Not
working all the time yet.

Busy Weekend.