tests don't run directly on import.

hashes with a block size other than 64 bytes (such as sha384 and sha512).

members even though comments to the archive itself aren't currently
supported.

 * get compiling with older versions of python again for a stand alone release.

Improve test_lock's tempdir creation and cleanup.

pay attention to them when opening an existing database.  This means
that d[] behaves properly even on databases previously created with DB_DUP
or DB_DUPSORT flags to allow duplicate keys.

http://sourceforge.net/tracker/index.php?func=detail&aid=477182&group_id=13900&atid=113900

Do not backport, this bugfix could be considered an API change.

I hope the concept of hashability is better understandable now.
Thanks to Tim Hatch for pointing out the flaws here.

--with-system-ffi configure option defaults to "yes" because the
bundled libffi sources are too old.

a problem introduced by 58385.

have NULL bytes in them.  Replace the errant strdup with a
malloc+memcpy.  Adds a unit test for the correct behavior.

Backport of import tests for bug http://bugs.python.org/issue1293 and bug http://bugs.python.org/issue1342