New in 0.4:
* Small bugfix: Pure "delete event"s were having some problems with my
modal window code.

* Added "Ctl-O" as an accelerator of "Open"

New in 0.3:
* Added modal window support.

* "cancel" buttons now work.

* Data file-selection window opens.

New in 0.2:
* Basic GUI functionality has been added to the main window.

New in 0.1:
* Basic layout completed. Nothing actually does anything.
