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GraphThing 0.9.3 released

Hi All,

GraphThing 0.9.3 is now available, chock full of cool little features
just in time for Christmas (http://graph.seul.org).

The following changes have been made since 0.9.2:

	+ Added full simple digraph support, including:
		digraph edge drawing and printing, with weights
	+ Eulerian tours are constructed and demonstrated
	+ Chromatic numbers are justified by demonstration, where possible
	* Large optimisations for colouring-related computations
	* Fixed matrix exponentiation for the A^0 case
	* gcc 3.2 fixes

Please have a good play with it, epecially the digraph support and the
graph colouring features. Let me know what works, and what doesn't.



"Computer science is no more about computers
  than astronomy is about telescopes."
	- E.W. Dijkstra