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

[STINNER Victor]

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

x.numbits() is:
  math.ceil(math.log(abs(x)) / math.log(2)) if x != 0
  0 otherwise

and not 1 + math.floor(math.log(x) / math.log(2))

(16).numbits() is 4, not 5.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue3439>
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