* Add Feigenbaum constant.
* Add isnan to real_concept. Convert test_constants.cpp to math_unit_test.cpp.
* Reduce ULP tolerance to 2, which is the minimum that passes on my machine.
* Improvements to Feigenbaum.
* Ok this is pretty complicated . . . [CI SKIP]
* Take jzmaddock's suggestion to remove additions to real_concept.
* Remove test the demonstrates throw.
* Use BOOST_STATIC_ASSERT_MSG to retain C++03 compatibility.
* More precise conversion from binary to decimal.
* Plastic constant.
* Fix typos.
* New tests [CI SKIP]
* bugfix in test [CI SKIP]
* Update docs for new constants [CI SKIP]
* Fix outdated instructions [CI SKIP]
* Do C++11 check for new constants.
* Update constants.qbk [CI SKIP]
* Hopefully green up build
* Constants still *work* in C++03, but now they must be tested in C++11 mode.
* Remove boost::math::isnan.
* Test file requires C++17.
* CHECK_LE for math_unit_test.hpp
* CHECK_CONDITIONED_ERROR
* Always accept 1ULP accurate evaluation
* Use new features of math_unit_test to test wavelet_transform.
