Fixed expression-template incompatibility in spherical_harmonic.hpp.
Fixed expression template issues in log1p_expm1_test.hpp and test_cbrt.hpp.
[SVN r83775]
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]