MSC: short far _remapallpalette( long far *colors )
	MSC: long far _remappalette( short pixnum, long color )

	- prototype in graph.h

	- colors = color number array containing one color per video
		   mode color
	- pixnum = pixel to change
	- color = new color number

	Valid colors are:

	_BLACK		_BLUE		_BRIGHTWHITE	_BROWN
	_CYAN		_GRAY		_GREEN		_LIGHTBLUE
	_LIGHTCYAN	_LIGHTGREEN	_LIGHTMAGENTA	_LIGHTRED
	_YELLOW		_MAGENTA	_RED		_WHITE

	- _remapallpalette() remaps all pixel values; _remappalette()
	  affects on the pixel specified by pixnum
	- _remapallpalette() returns -1 on success; zero otherwise
	- _remappalette() previous color value of "pixnum" on success; -1
	  otherwise