pal_id	IN:	Palette identifier returned by GRgetlutid
	pal_data	OUT:	Buffer for the palette data

	Purpose	Reads a palette.
	Return value	Returns SUCCEED (or 0) if successful and FAIL (or -1) otherwise.
	Description	GRreadlut reads the palette specified by the parameter pal_id into the buffer pal_data.
		Note that there are two FORTRAN-77 versions of this routine; one for numeric data (mgrdlut) and the other for character data (mgrclut).

	FORTRAN	integer function mgrdlut(pal_id, pal_data)
		integer pal_id
		<valid numeric data type> pal_data(*)
		integer function mgrclut(pal_id, pal_data)
		integer pal_id
		character*(*) pal_data