(screensaver activation and deactivation) has 2 managers right now.  oble and
gnome-screensaver have independent criteria for activation and deactivation.
oble relies only on time since face detected, gss relies on time since keyboard
or mouse state change.  this causes annoying problems.
	* example: gss activates screensaver on timeout even though face is clearly
	detected the whole time.
	* workaround: make gss timeout be as long as possible
there are other problems.
the real fix is to combine the two.  user activity should be any of {keyboard,
mouse, face detection}.