The codecs themselves were restored in Python 3.2, this
completes the restoration by adding back the convenience
aliases.

These aliases were originally left out due to confusing
errors when attempting to use them with the text encoding
specific convenience methods. Python 3.4 includes several
improvements to those errors, thus permitting the aliases
to be restored as well.

Revert utime(..., None) strategy (it has too poor resolution under Windows) and restore the previous test workaround
(issue #19715)

in test_pathlib.

Purposefully designed to work from a specified directory in case
multiple file systems are used on the system.

Only possibly-controversial change: joinpath() was described as:

  "Calling this method is equivalent to indexing the path with each of
  the *other* arguments in turn."

'Indexing' is an odd word to use, because you can't subscript Path or
PurePath objects, so I changed it to "combining".

Also, attempt to reduce confusion in the glossary by not saying there are
different "types" of arguments and parameters.

asyncio: Pass cancellation from wrapping Future to wrapped Future. By Saúl Ibarra Corretgé (mostly).

class.

built-in loading; leads to a reload scenario where attributes get set
which are wrong after the test.