Change similarity metric to lin metric #34
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rababerladuseladim
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Add the lin metric for semantic similarity and make it the default.
formula: (2 * info_content(mica)) / (info_content(go_id1) + info_content(go_id2)) where mica is the most informative common ancestor of go_id1 and go_id2.
The lin metric is implemented according to: Lin, Dekang. 1998. “An Information-Theoretic Definition of Similarity.” In Proceedings of the 15th International Conference on Machine Learning, 296—304.
Fixes issue #32