INT 10 - VIDEO - GET INDIVIDUAL PALETTE REGISTER (VGA,UltraVision v2+)

	AX = 1007h
	BL = palette or attribute (undoc) register number (see #00017)
Return: BH = palette or attribute register value
Note:	UltraVision v2+ supports this function even on color EGA systems in
	  video modes 00h-03h, 10h, and 12h; direct programming of the palette
	  registers will cause incorrect results because the EGA registers are
	  write-only.  To guard against older versions or unsupported video
	  modes, programs which expect to use this function on EGA systems
	  should set BH to FFh on entry.
SeeAlso: AX=1000h,AX=1009h