ri_id	IN:	Raster image identifier returned by GRcreate or GRselect
	pal_index	IN:	Index of the palette

	Purpose	Gets the identifier of a palette given its index.
	Return value	Returns the palette identifier if successful and FAIL (or -1) otherwise.
	Description	GRgetlutid gets the identifier of the palette attached to the raster image identified by the parameter ri_id. The palette is identified by its index, pal_index.
		Currently, only one palette can be assigned to a raster image, which means that pal_index should always be set to 0.

	FORTRAN	integer function mggltid(ri_id, pal_index)
		integer ri_id, pal_index