colors.i4.v = tv_colors(foregnd_color.i4.v [,backgnd_color.i4.v]

	This routine converts foreground color, background color, and
	blink codes into a single value for use with various TV I/O
	routines.  For C programmers, there is a macro named TV_COLORS
	in macro.h which performs the same function as this routine.

	foregnd_color	foreground color (constants are in cnsparam)
	[backgnd_color]	background color (constants are in cnsparam)
			(default is BLACK)
	[blink]		blink (default is NOBLINK)

	This function requires the following include files:

	cnsparam_h, cbslib_h

	Related functions:

	tvcolors, window_tvm(_c), window_blank(_c), window_border_button_c,
	window_box_c, window_rectangle_c, window_hline_c, window_vline_c,
	window_text_color(_c), window_text_fill(_c), window_write_line_c,
	window_write_scroll_c, window_center_text(_c), window_retitle_c,