Color bars, Beam ellipses.

Color bars are obviously needed, but require a fair amount of work. It involves managing special-purpose subpanels on the pixelcanvas (with special-purpose DDs), and controlling them based on main panel DD activity. Much of this was in glish previously, and will have to be reimplemented.

Similar comments apply to beam ellipses. This one may want to be reimplemented in the main library, within the image DDs themselves.

-- DavidKing - 02 Nov 2006