boost/graph/graph_traits.hpp -- workaround for a vc6 ICE

boost/graph/adjacency_matrix.hpp,
boost/graph/detail/adjacency_list.hpp -- use boost/limits.hpp instead of <limits>, for portability.


[SVN r19388]

libs/graph

@@ -1 +1 @@
-Subproject commit fd2844b35a660831a46f62073d2212dc41e61a51
+Subproject commit 5f98c9923ceb81e09829445aba2f9604c1c812bd