[pygtk] user-controllable treeview column suppression

[Skip Montanaro]

    Steve> Kiwi has a nice way of doing it. Its CList object has a popup
    Steve> menu on the right click where the user can decide which columns
    Steve> to display.

Thanks for the pointer.  I installed it but importing Kiwi failed with an
ImportError (no module named libglade).  We import glade here as gtk.glade.
I don't know if that means we're weird or that PyGTK has changed since Kiwi
was last released.

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