Issue #23576: Avoid stalling in SSL reads when EOF has been reached in the SSL layer but the underlying connection hasn't been closed.

These functions are not documented but used in third-party code.

Patch by Alex Shkop.

The test checks that the environ argument contains correct headers,
querystring and path information.

Patch by Alex Shkop.

TOS is an abbreviation of top-of-stack.

Patch by Sven Berkvens-Matthijsse.

Also, remove support.run_doctest() since there is no doctests in
test_urllib2 and urllib.request.

 * Eliminated OverflowError from timedelta * float for some floats;
 * Corrected rounding in timedlta true division.

On Windows an OSError with errno=EINVAL is raised.

statement if the pipe was broken.  Patch by Martin Panter.

Methods only raise NotImplementedError and are never used.

Reported by Jon Colburn on docs@.

Also, update email examples to use the context manager version of open().

Patch by Baptiste Mispelon.

See
de Gouw, Stijn and Rot, Jurriaan and de Boer, Frank S and Bubel, Richard and Hähnle, Reiner
"OpenJDK’s java.utils.Collection.sort() is broken: The good, the bad and the worst case"