* Use boost::math::signbit rather than comparison to zero.
* Use boost::math::changesign rather than unary negation (unary negation fails for Intel on Linux when the argument is a zero).
* Update to use boost::math::isnan/isinf rather than the old code.
* Update to use boost::math constants.
Fixes#6171.
[SVN r75933]
On Linux, GNU's libstdc++, which is the default stdlib for icc and clang,
cannot parse the <iomanip> header in version 4.5+ (which thankfully neither
compiler advises the use of yet), as it's original C++98-friendly
implementation has been replaced with a gnu++0x implementation.
<boost/detail/iomanip.hpp> is a portable implementation of <iomanip>, providing
boost::detail::setfill, boost::detail::setbase, boost::detail::setw,
boost::detail::setprecision, boost::detail::setiosflags and
boost::detail::resetiosflags.
[SVN r68140]
Made sure that if BOOST_MATH_NO_LONG_DOUBLE_MATH_FUNCTIONS is defined, then no long double overloads are actually instantiated by the tests.
[SVN r41007]
