New macro assert-to-tolerance and constants defining tolerances
Introduced a new macro #'assert-to-tolerance to be used in lisp-unit:define-test forms that takes three arguments: form expected-value tolerance. This replaces test-tol6 that was defined in tdist.lisp. Defined the tolerance constants +test-tol6+ the exact same way as GSL, but grovelling machine.h where GSL_DBL_EPSILON is defined.
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