This adds the "info windows" and "delete window" commands. "info windows" unfortunately overlaps with the TUI's "info win". So maybe we should rename this one. This also adds a new "toplevel" component that knows how to track windows.
This adds the "finish" command to the GUI. It also wires up the "stop" button, but that still doesn't seem to work.
This ports the code to PyGObject, and also changes it to use Glade to edit the user interface elements.