changed has_target() to incident_to(), and added incident_on() and

connects()


[SVN r9575]

libs/graph

@@ -1 +1 @@
-Subproject commit 392bf8629098c46539f6ab95211d7d5f963ecb8e
+Subproject commit 6932248ef4ce70e2ddea0254e076e0953b2b8226