[issue3366] Add gamma function, error functions and other C99 math.h functions to math module

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

Thanks!  The patch is against the trunk.  (It doesn't quite apply cleanly 
to py3k, but the changes needed to make it do so should be minimal.)

Hmm. Rereading my previous comment, I seem to have a blindness for 
negative signs:

    gamma(x) = -pi/sinpi(x)/x/gamma(x)

should have been

    gamma(-x) = -pi/sinpi(x)/x/gamma(x)

and

    (-256.0, 1/256.0] + [1/256.0, 256.0)

should have been

    (-256.0, -1/256.0] + [1/256.0, 256.0)

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<http://bugs.python.org/issue3366>
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