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

TESTFN_NONASCII of test.support from Python 3.4. Backport tests on non-ASCII
paths.

ASCII/surrogateescape codec is now used, instead of the locale encoding, to
decode the command line arguments. This change fixes inconsistencies with
os.fsencode() and os.fsdecode() because these operating systems announces an
ASCII locale encoding, whereas the ISO-8859-1 encoding is used in practice.

Patch by Martin Packman.

with the surrogateescape error handler, instead of UTF-8 in strict mode.

Added a test for tk_setPalette().

Issue #16485: Fix file descriptor not being closed if file header patching fails on closing of aifc file.

The code isn't exactly equivalent because a classmethod would
only make sense inside a chain class, and it would need "cls"
as a first argument, and it would need to return an instance
of "chain" rather than a generator.

The updated example drops the @classmethod decorator so that
it can be used standalone:  list(from_iterable(['abc', 'def']))
This should be communicate what from_iterable does.