Remove useless anyhow errors from read_coef that were causing significant overhead #72
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Anyhow errors provide nice handling of errors with stack traces etc, but read_coef doesn't actually need this since it doesn't actually generate any errors except for the possible std::io::Errors from reading the input. There was about a 1% overhead caused by constructing and deconstructing these objects since read_coef is used in the inner loop.