Harmonize docstrings.  Move redemo from Tools/scripts to Tools/demo.  Add a README file to Tools/demo.

More cleanup: Move some demos into a dedicated Tools/demo dir, move 2to3 demo to Tools, and remove all the other Demo content.

There is a small chance of backward incompatibility here, but only for
non-SimpleCookie applications reading SimpleCookie generated cookies.  Even
then, any such ap is likely to be handling escaped values already, and it would
take a fairly perverse implementation of unescaping to fail to unescape these
newly escaped chars, so the risk seems minimal.

on Windows, and is no longer needed by any tests or Lib/test/support.py

existing and mentioned the OSError possibility.

when the user doesn't hold the symbolic link privilege rather than hiding it.

 * Replace "bytes" by "bytes object" in struct error messages
 * Document the API change in What's new in Python 3.2
 * Fix test_wave
 * Remove also ugly implicit conversions in test_struct

#10739: document that on Windows, socket.makefile() does not make a file that has a true file descriptor usable where such a thing is expected.