Check saving column and window sizes betwen setup dialogs.

Fix up complaining about unreadable log file.  Do that in only one place.

Fix default sizing for listview widget.  Worth the effort?

Reorganize the main window to place the buttons in a toolbar and
the packet summary in a statusbar at the bottom of the window?

Left over from Nick's Todo:
  Source IP displayed as hostname?
  Filter for ports/packets to ignore?
