Correct silly typo in unchecked_factorial.hpp.
Remove TEST_STD define in config.hpp as it needlessly breaks the TR1 tests.
Remove lexical_cast.hpp workaround file.
Correct #pragma in tr1.hpp.
Recent changes to tanh_sinh alters the order in which values are summed: this can randomly change the found error for either better or worse, and so the 1eps tolerance here was over-optimistic.