ContourWidget

ContourWidget is used in DisplayTest 1 but I can't find an explaination
for all the "controls" in contains. The labels and dashed line checkboxs
the interval and base and the cute movable arrow at the bottom all "work"
but seem to have no effect on the display.

The contour checkbox and JSlider of course work.

I looked at the javadoc and lib Dev Guide but neither seem to address this.
I also see the Milky Way Designer does not use the ContourWidget.

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