2009-11-30 Vladimir Serbinenko <phcoder@gmail.com>

	Agglomerate scrolling in gfxterm.

	* term/gfxterm.c (grub_virtual_screen): New member 'total_screen'.
	(grub_virtual_screen_setup): Initialise 'total_screen'.
	(write_char): Split to ...
	(paint_char): ... this ...
	(write_char): ... and this.
	(paint_char): Handle delayed scrolling.
	(draw_cursor): Likewise.
	(scroll_up): Split to ...
	(real_scroll): ... this ...
	(scroll_up): ... and this.
	(real_scroll): Handle multi-line scroll and draw below-the-bottom
	characters.
	(grub_gfxterm_refresh): Call real_scroll.