* clutter/clutter-actor.h:
	* clutter/clutter-actor.c:
	(clutter_actor_get_abs_opacity): Add function that does what
	get_opacity() does now...

	(clutter_actor_get_opacity): ... and make get_opacity() do what
	it's supposed to be doing. The original get_opacity() returned
	a composited value, and there's no way to actually extract the
	real opacity value set with set_opacity().

	* clutter/clutter-clone-texture.c:
	* clutter/clutter-rectangle.c:
	* clutter/clutter-texture.c: Update to use get_abs_opacity().

	* clutter/clutter-entry.c:
	* clutter/clutter-label.c: Ditto. Also, never change the stored
	alpha value. (#804)

	* tests/Makefile.am:
	* tests/test-opacity.c: Test suite for the get_opacity() and
	get_abs_opacity() API, and correct opacity handling.

	* README: Add note about the change in get_opacity().