[issue1640] Enhancements for mathmodule

[Christian Heimes]

Christian Heimes added the comment:

I disabled the tests for atanh0022 and atanh0023.

Other changes:
Added math.log1p + tests
Added SUN license to Doc/licenses.rst
Added docs to Doc/library/math.rst

Added file: http://bugs.python.org/file9251/trunk_pymath_hyberbolic_complex2.patch

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