Add hooks for the dcdflib to the incomplete gamma tests.
Add hooks for the dcdflib to the igamma performance tests.
Some small performance enhancements.
[SVN r56370]
New special functions for truncation and rounding, plus exponential integrals and zeta.
New non central distributions.
Updated equation png's so that they are all consistent.
[SVN r44091]
Added more Remez code, and appoximations for erf/erfc inverses.
Updated and refactored erf code to use new approximations.
Added more test cases.
[SVN r3210]