Finished the Layer Setup Dialog.  I assumed that the new layer order will
    be in place soon.  It works fine now, but the layer order is probably
    misleading, since it does not reflect the current stackup but rather the
    future stackup.  I dropped support for a single layer board. The minimum
    is two copper layers.  Avoid the side you don't want anything on.

    Within a month I should have the layer visibility and selection widget
    in place.