Fix array declarations so GCC doesn't warn about them.
Declare constants in headers so they can be used by UDT's larger than type long double.
Suppress a few warnings and fix a couple of bugs that showed up when testing with UDT's.
[SVN r75960]
Added first cut of the non-central chi squared distribution.
Removed almost all occurrences of real_cast: replaced with calls to the truncation/rounding functions instead.
[SVN r42744]
Fixed a lot of gcc-linux issues: mostly missing "using namespace std" declarations.
Added new concept check to test for these kinds of failures at compile time.
[SVN r3344]
