sillydan1/graphedit

Diff algorithm can be improved

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The current implementation is O((M+N) * D). The original paper describes a way of reducing that down to O(D * N) using some dijkstra magic. (see the original paper: http://btn1x4.inf.uni-bayreuth.de/publications/dotor_buchmann/SCM/ChefRepo/DiffUndMerge/DAlgorithmVariations.pdf )