Support rank=min/max within the context of a cluster.
<li>
Adjust graph to allow no edge-node overlap with line segment edges.
+<li>
+Write a replacement for smyrna/gvedit/dotty that provides a GUI interface for Graphviz. In addition,
+to the usual functions for viewing, the program should provide widgets for the easy altering of graph
+attributes. There could also be an interface to the gvpr library, to create multiple views. Ideally,
+the system could also the user to easily tailor the interactions.
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