Correct Bernoulli-log estimation formula. Remove some, but not all, warnings for x64 size_t versus int, unsigned.
Use ACM TOMS 748 bracketed root finding to estimate the index of the B2n that might overflow.
Simplify the overflow index calculation (now based on root-finding).
Fix error message strings.
Merge branch 'bernoulli-numbers' of https://github.com/boostorg/math into bernoulli-numbers
Add include test.
Improve error handling and overflow-estimation in bernoulli_details.hpp.
Add some needed typecasts for x64 platform
Add Chris's optimized expression for the asymptotic formula.
Fix some bugs in use of asymptotic formula (2N vs N mixup).
Fix some MSVC warnings.
Remove some compiler warnings VC x64 size_t versus int / unsigned.
Merge branch 'bernoulli-numbers' of https://github.com/boostorg/math into bernoulli-tgamma