Integrated new implementation of howard's cycle ratio algorithm. It's an

optimization and cleanup from the older version. Note that this breaks
source compatability in one instance.


[SVN r54999]

libs/graph

@@ -1 +1 @@
-Subproject commit 925fd6a2d65021bda038b539eec0c5ab13f8b6f4
+Subproject commit 083d6b83aa4dc7d79d3d6f1e92b13e4138df0cef