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

[Daniel Stutzbach]

Daniel Stutzbach <daniel at stutzbachenterprises.com> added the comment:

Any time I've ever needed log2(x), log(x)/log(2) was sufficient.

In Python, exp2(x) can be spelled 2.0**x.  What would exp2(x) gain us?

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