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

[STINNER Victor]

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

Oops, you're right Mark: PyErr_Clear() is needed! New patch:
 - don't catch error different than PyExc_OverflowError in 
long_numbits()
 - clear error in long_numbits()
 - fix doc indentation

About the indentation: i'm using >>svndiff='svn 
diff --diff-cmd="/usr/bin/diff" -x "-ub"'<< instead of svn diff 
because my editor removes trailing spaces.

I prefer to keep the "fast path" (use _PyLong_NumBits) as *you* 
proposed in another message: Message75767.

Added file: http://bugs.python.org/file12327/numbits-6.patch

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<http://bugs.python.org/issue3439>
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