(30 jan 2012, pshannon, 1.4.4): now imports four more methods from graph: edgemode, addNode, addEdge, requested by Robert Flight.
(28 dec 2011, pshannon, 1.4.3): vignette now cleans up after itself, deleting the windows it created
(27 dec 2011, pshannon, 1.4.2): fixed bug in setNodeLabelDirect.  Multiple nodes, one label now works. 
(26 dec 2011, pshannon, 1.4.1): setCenter now casts x,y to numeric before sending out to CyRPC
(06 dec 2010, pshannon, 1.1.8)
(12 aug 2010, pshannon): first preliminary release