Update ROADMAP.
Update ROADMAP.

	* doc/ROADMAP: Events are implemented but leak memory when an
	handler is stopped. Mark the necessary steps in the ROADMAP, for
	TP4.

urbiforge/urbi,aldebaran/urbi,urbiforge/urbi,urbiforge/urbi,aldebaran/urbi,aldebaran/urbi,urbiforge/urbi,aldebaran/urbi,urbiforge/urbi,urbiforge/urbi,urbiforge/urbi,aldebaran/urbi,aldebaran/urbi,urbiforge/urbi,urbiforge/urbi,aldebaran/urbi,aldebaran/urbi