Add doesNotThrow() and an inspect callback for throws() - #27
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Two idioms the family tests still had to spell out by hand: "this input is accepted" (a bare call followed by addToAssertionCount) and "the exception carries this status code" (a try/catch around the call). doesNotThrow() covers the first; throws() now takes an inspect callback for the second, so the exception can be checked with ordinary fact() calls.