Fix UObject plugin inheritance.
Fix UObject plugin inheritance.

I can't find any justification for this hack. Test suite still OK.

	* src/kernel/uobject.cc(uobject_make_proto): No longuer hack
	object inheritance when cloning uobjects.

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