use time_t instead of int.  This gives support for dates after 2038,
at least when compiled with VS2003 or later, where time_t is 64bit.

too few POSIX semaphores.

* In asctime and ctime, properly remove the newline if the year has more than four digits
* Consistent error message for both functions
* Fix the test comments and add a check for the removed newline

the codec aliases. They are still accessible via codecs.lookup().

and DragonFly BSD.  Patch by Nicolas Joly.

Use super() instead of direct references to the dict superclass.

#10801: In zipfile, support different encodings for the header and the filenames.  Patch by MvL, test by Eli Bendersky.

Patch by John Chandler.

Add the missing __main__.py in the turtledemo package.  It seems to have been lost during some mass rename action (r86095).

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.