Issue #16884: updated logging documentation to include lastResort and use 'note' directives where appropriate.

Found by Christian with Coverity.

Issue #8109: The ssl module now has support for server-side SNI, thanks to a :meth:`SSLContext.set_servername_callback` method.
Patch by Daniel Black.

In conformance with the documentation and the Python version.
Patch by Franck Michea.

In conformance with the documentation and the Python version.
Patch by Franck Michea.

close-on-exec flag atomically.

a key whose repr raise an exception.

a key whose repr raise an exception.

non-pydebug builds. Several extension modules now compile cleanly when
assert()s are enabled in standard builds (-DDEBUG flag).

non-pydebug builds. Several extension modules now compile cleanly when
assert()s are enabled in standard builds (-DDEBUG flag).

"honor direction and do a forward or backwards search": the runtime speed may
be different, but I consider that it doesn't really matter in practice. The
direction was never honored before: Python 2.7 uses memcmp() for the str type
for example.