Features:
Undo
Allow user control of max. node size
Set focus on a node
  "Find node whose name is abc"
=>File browser should return to previously used directory
Re-add "Select all nodes/edges" operations?
edge positions should be handled by smyrna if available

Multiple views
GUI for canned gvpr programs
Additional edge attributes : dash/dotted, width
Multiedges
Select in 3D
Mechanism for semantic zoom
  separate overlapping nodes
  add more detail
alpha, node size in topfish

Bugs: 

Catch window kill button for node list
Use full disk when picking nodes
Why is smyrna so slow to shut down?

Labels don't appear when alpha colors are enabled 
Edges should not disappear when node is off screen ?
Make sure all buttons do something or remove them
Trap "window close" on Smyrna Settings widget, or fix problem