[issue1640] Enhancements for mathmodule

[Christian Heimes]

Christian Heimes added the comment:

The trunk_math_sign_inf_nan patch contains just three new method
isnan(), isinf() and sign(). It also fixes a minor numerical issue with
one function that did small / (small / large) instead of small * (large
/ small).

Added file: http://bugs.python.org/file8989/trunk_math_sign_inf_nan.patch

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