Checked in for Mo DeJong:

Checked in for Mo DeJong:

        * itk/library/Toplevel.itk (destructor):
        * itk/library/Widget.itk (destructor): Remove the
        hull component after destroying the hull.
        Destroy any component that still exists after
        destroying the hull since it must have been
        created outside the hull.
        * itk/tests/toplevel.test:
        * itk/tests/widget.test: Test that a component
        outside the hull is destroyed when the mega-widget
        is destroyed.