for the OpenSSL server-side session cache.

urllib.request.urlopen now take optional arguments to allow for
server certificate checking, as recommended in public uses of HTTPS.

current directory was deleted.

method.

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.