Update history and regenerate docs.

[SVN r85984]
Math: Remove use of obsolete macro

BOOST_NO_EXPLICIT_FUNCTION_TEMPLATE_ARGUMENTS was defined for old
DMC, which is no longer supported.

 https://svn.boost.org/trac/boost/changeset/85272

[SVN r86042]
Math: Remove obsolete GCC version checks.

[SVN r86071]
Fix test case.

[SVN r86178]
Improve quantiles of discrete distributions to round trip integers more often.
Fixes #9183.

[SVN r86205]
Added colors and alignment to html

[SVN r86227]
Remove BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION

Process #ifndef...#else...#endif blocks.

[SVN r86245]
Fix for sph_bessel when v is large and x is small.

[SVN r86343]
Previous commit failed for types with an extended exponent range - use logarithms rather than assuming the result is zero.

[SVN r86346]
Update 1.55 release notes, regenerate docs.

[SVN r86347]