makeunicodedata.py: download all data files from unicode.org,
  switch to extracting Unihan data from zip file.
  Read linebreakprops and derivednormalizationprops even for
  old versions, even though they are not used in delta records.
test:unicode.py: U+11000 is now assigned, use U+14000 instead.

Akira Kitada.

Windows

encodings

custom certificate and private key files used by SSL-related certs.

easier writing of unit tests and better error reporting.

The work on this is not 100% complete, but everything is present to
allow real-world testing of the code.  The only remaining major todo
item is to (hopefully!) enhance the handling of non-ASCII bytes in headers
converted to unicode by RFC2047 encoding them rather than replacing them with
'?'s.

verification for higher-level protocols.

.. instead of raising a fatal error. Even if the current directory was deleted,
use relative paths may still work (eg. run Python with "../python").

On Windows, Py_UNICODE is wchar_t, so we can avoid the expensive Py_UNICODE*
=> wchar_t* conversion.

 * Don't define _Py_wstat() on Windows, Windows has its own _wstat() function
   with a different API (the stat buffer has another type)
 * Include windows.h

I suppose that I reapplied my local patch creating Python/fileutils.c whereas
the file already existed.

 * _Py_fopen() and _Py_stat() come from Python/import.c
 * (_Py)_wrealpath() comes from Python/sysmodule.c
 * _Py_char2wchar(), _Py_wchar2char() and _Py_wfopen() come from Modules/main.c
 * (_Py)_wstat(), (_Py)_wgetcwd(), _Py_wreadlink() come from Modules/getpath.c

Use _Py_wchar2char() to support surrogate characters in the input path.