This makes the failing tests (test_unicodedata and, on OSX, test_hashlib) pass.

XXX However, I'm not sure that this is the right thing to do;
this behavior means that Unicode strings are automatically hashed as their
UTF-8 encoding.  Is that what we want?

but without it test_string passes.  I'm not sure why it was there.

Patch by Christian Heimes.

Once Barry and the email-sig have a working new version
we'll add it back.
If it doesn't make the 3.0a deadline (release August 31), too bad.

Known issues:

The string.Formatter class, as discussed in the PEP, is incomplete.

Error handling needs to conform to the PEP.

Need to fix this warning that I introduced in Python/formatter_unicode.c:
Objects/stringlib/unicodedefs.h:26: warning: `STRINGLIB_CMP' defined but not used

Need to make sure sign formatting is correct, more tests needed.

Need to remove '()' sign formatting, left over from an earlier version of the PEP.