handle degenerecies

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Confirmation of degeneracies were added as a test in 8b50945

http://arxiv-web3.library.cornell.edu/pdf/1211.3376v1.pdf is an extension of the Greiner-Hormann algorithm that apparently handles degeneracies

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some potentially functional pseudocode - http://stackoverflow.com/questions/25147611/whats-wrong-with-this-pseudocode-for-forster-overfelts-version-of-the-greiner