Routine Name:	xcolorscale

Description:	Sets the color scale for mapping numerical values to
                color.

Usage:		xcolorscale colorscale
		colorscale:	hot, rainbow, rainbow2, redhot, or grey

Example:	xcolorscale hot

Notes:		The colorscale (which is a file in genesis/startup) applies
                to pixes which have a field mapped to color, such as the
                shapes in an xvar or xview, or the cell display in xcell.  It
                does not apply to widgets, like buttons, labels, etc.

