* src/macfns.c: Rename everything containing *busy_cursor* and

* src/macfns.c: Rename everything containing *busy_cursor* and
	similar to *hourglass*.
	Change IMAGE_POSITIVE_INTEGER_VALUE to
	IMAGE_POSITIVE_INTEGER_VALUE_OR_PAIR throughout.
	(x_set_font): If font hasn't changed, avoid recomputing faces and
	other things, as in xfns.c.
	(Qcancel_timer): New variable.
	(syms_of_macfns): Rename x-busy-pointer-shape to
	x-hourglass-pointer-shape, display-busy-cursor to
	display-hourglass, busy-cursor-delay to hourglass-delay, as in
	xfns.c.
	(x_set_tool_bar_lines): Modify as in xfns.c
	(x_change_window_heights): New function.

	* inc/macterm.h (struct x_output): Rename busy_cursor to
	hourglass_cursor, busy_window to hourglass_window, busy_p to
	hourglass_p, as in xterm.h.

	* src/macmenu.c (set_frame_menubar): Run activate-menu-bar-hook with
	safe_run_hooks, as in xmenu.c.

	* src/macterm.c (do_check_ram_size): New function.

	* src/Emacs.r: Add ALRT resource #129 for alert when there is over
	256 MB RAM.