Fix assert-to-tolerance; remaining exponential-function tests ported
The macro #'assert-to-tolerance was not correct but now maps to sf-check-results. The order of arguments in the sf-frac-diff call in sf-check-single has reversed to match test_sf_check_result in the GSL code. The remaining exponential-function tests have been ported except for the one involving gsl_sf_exprel_n_CF_e which hasn't been ported. All the tests except one pass.
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