Fix raise_rounding_error to return the correct result (and type) when an error occurs.
Fixes #7905.

svn path=/trunk/boost/math/; revision=82885
Added test_bessel_airy_zeros to jamfile to allow testers to run it.
(passes on a local test using MSVC and compiles OK on Clang and gcc)

svn path=/trunk/libs/math/; revision=82894
use Kahan formula where max_digits10 not available.

svn path=/trunk/libs/math/; revision=82899
Use more accurate values for airy zeros as max and min to suit 80 bit long double platforms.

svn path=/trunk/libs/math/; revision=82900
Updated version to try to show subscript zero correctly.  OK on al except Inkscape :-(

svn path=/trunk/libs/math/; revision=82903
Many docs changes for unsigned to int for parameter m.

svn path=/trunk/libs/math/; revision=82904