Add back some of Russ's code that allowed for clicking on the map, and
getting a crosshair painted in. Also use those coords and the pixels_per_meter conversion from the DB to print out for the user where he just clicked. Change the SHOWNODE function to print out the coordinates (so when you click on a robot in the map, you get a line that says what its coords are). Also generate table of all robot positions to place below the image.