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

[Fredrik Johansson]

Fredrik Johansson <fredrik.johansson at gmail.com> added the comment:

FYI, Brent & Zimmermann call this function nbits(n) in "Modern Computer
Arithmetic": http://www.loria.fr/~zimmerma/mca/pub226.html

I don't really care much about the name though.

In the documentation, should "same value as ``x.bit_length``" not be
"same value as ``x.bit_length()``"?

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