Generalized layout algorithms to use extended version of topology objects from Gursoy-Atun layout; Kamada-Kawai now supports 3-D; random layout supports arbitrary topologies

[SVN r52137]

libs/graph

@@ -1 +1 @@
-Subproject commit 7ce44fc213ec67d59fc7bb279e79fe8b11306640
+Subproject commit 5b53e4e6e8e3654c9e58145fd07b5c67e8ef850b