Fix the clone generation.
Fix the clone generation.

Use the cloning routines including for member that are not initialized by
the ctor.

	* dev/ast-cloner-gen (attribute_dup): New.
	(attribute_clone): Use it.

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