enforce typing difference between P_graph / G_graph (with the same on node and edge)
git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/semagramme/libcaml-grew/trunk@6721 7838e531-6607-4d57-9587-6c381814729c
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git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/semagramme/libcaml-grew/trunk@6721 7838e531-6607-4d57-9587-6c381814729c