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

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

Here's an updated patch, with the following changes from the original:

- make the size of a digit (both the conceptual size
in bits and actual size in bytes) available to Python
via a new structseq sys.int_info.  This information
is useful for the sys.getsizeof tests.

- fix a missing cast in long_hash

- better fast path for 1-by-1 multiplication that
doesn't go via PyLong_FromLongLong.

Added file: http://bugs.python.org/file11936/30bit_longdigit2.patch

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