 graphtest example plugin:
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 This example plugin for IDA 5.0 (and above)
 shows you how to use the new graphing interface
 and some of its new callbacks.
 The plugin adds an item to the graph's popup-menu
 and lets you choose one of three layout algorithms
 (circle, tree and digraph) for the graph.
 
 how to compile:
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 make a copy of the vcsample workspace (idasdk/plugins/vcsample),
 remove strings.cpp from, and add layout.cpp to the workspace ;)
 
 Author: Dennis Elser