Change tuples implementation: make a generic tuple class.
Change tuples implementation: make a generic tuple class.

One can now create a tuple of any arity with Tuple.new(1, 2, 3, ...). Pair and
so on are still available.

    * share/urbi/tuple.u: Here.

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