increase bound in the rewriting depth

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/semagramme/libcaml-grew/trunk@6651 7838e531-6607-4d57-9587-6c381814729c

src/rule.ml

@@ -59,7 +59,7 @@ module Rule = struct
   type pid = int
   type gid = int
 
-  let max_depth = ref 50
+  let max_depth = ref 500
   exception Bound_reached
 
   type const =