[issue4258] Use 30-bit digits instead of 15-bit digits for Python integers.

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

The last patch (30bit_longdigit14.patch) is obviously missing some
stuff, but other than that I think everything's fine and you could commit.

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<http://bugs.python.org/issue4258>
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