[issue3439] create a numbits() method for int and long types

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

> (-maxint-1).numbits() hangs

Ooops, nice catch! It was an integer overflow, already present in 
fredrikj's original patch. The new patch fixes this bug but also 
included a documentation patch ;-)

Added file: http://bugs.python.org/file11988/numbits-3.patch

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