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Scanner Overlay Menu

The Overlay menu should probably go away entirely, but for now it's here. There are three basic operations available:

USE OVERLAY
Controls whether contours are drawn in the SGI overlay planes. When overlay planes are not used, drawing will be considerably slower because the image needs to be refreshed after each change to the contour. Using the overlay planes gives faster drawing, but it can also result in some weird artifacts. Also, the color of the contour in the overlay planes is semi-hardwired because of hardware restrictions.
CLEAR OVERLAY
Clear the overlay planes. (Only has a noticeable effect if the USE OVERLAY option is turned on.)
BREAK
Break out of the Scanner program. This is strictly here for my own debugging purposes and should be removed once Scanner is installed.

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