SETPALETTE colornumber rgblist

	sets the actual color corresponding to a given number, if allowed by
	the hardware and operating system.  Colornumber must be an integer
	greater than or equal to 8.  (Logo tries to keep the first 8 colors
	constant.)  The second input is a list of three nonnegative numbers
	less than 100 specifying the percent saturation of red, green, and
	blue in the desired color.