Upstream changes:
2016-11-04 v1.999727 pjacklam
* Skip test exceeding the range of VAX floating point number in t/bigintpm.inc
(CPAN RT 118468).
* Fix typo in lib/Math/BigInt.pm (CPAN RT 118550).
2016-11-15 v1.999800 pjacklam
* Upgrade bundled Module::Install from version 1.16 to version 1.17.
* Add Math::BigInt::Lib (lib/Math/BigInt/Lib.pm), a parent class for
Math::BigInt backend libraries.
* Use objects in Math::BigInt::Calc, not just array refs. Also use OO-style,
i.e., use $class->_add($x, $y) rather than _add($class, $x, $y).
* Not all library methods modify the invocand, so call library methods as,
e.g, $x = $LIB->method($x, $y) rather than just $LIB->method($x, $y).
* Math::BigInt::Calc is now a subclass of Math::BigInt::Lib.
* Add Math::BigInt::Lib::Minimal (t/Math/BigInt/Lib/Minimal.pm) for testing
inheritance from Math::BigInt::Lib.
* Minor simplification in Math::BigInt::Calc->_str().
* Speed up Math::BigInt::Calc->_root().
* Remove test files that were included in the previous release by accident.
* Add more tests and use more verbose output in some tests.
* Fix typo in lib/Math/BigFloat.pm
* Fix documentation error in lib/Math/Calc.pm
* Use Config::Tiny and an .ini file to handle the library specific
configuration for the author-lib*.t test files.
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