Initial patch by Olive Kilburn.

be empty.

Add BaseEventLoop._closed attribute and use it to check if the event loop was
closed or not, instead of checking different attributes in each subclass of
BaseEventLoop.

run_forever() and run_until_complete() methods now raise a RuntimeError('Event loop is
closed') exception if the event loop was closed.

BaseProactorEventLoop.close() now also cancels "accept futures".

while still being written to. With no console, this closed Idle.
Also add missing import and a few other changes.

Patch by Milan Oberkirch.

Patch by Saimadhav Heblikar. (2 head merge)

Original patch by Amaury Forgeot d'Arc with a test by bdettmer.

Patch by Amandine Lee.

Patch by Víctor Terrón.

Patch by Skyler Leigh Amador.

Patch by εσχατοκυριος.

Patch by Katherine Busch.

Patch by Saimadhav Heblikar.

Subclass TextViewer to add mock methods instead of monkey-patching it.

Patch by Steve Dougherty.

- Nix the 'noxp' option, it was for Win2k compatibility (which was dropped
  with Python 3.3) and made default ttk ugly on post-Win2k systems (#21665)
- Use 'OPTS=symbols' instead of 'DEBUG=1'; symbols is the official method
- Use core, shell, dlls, install-binaries, and install-libraries targets
  instead of all and install to avoid trying to 1) build packages that don't
  work with MSVC 10+ and 2) install unnecessary bits and pieces.

Before, regrtest failed to remove the temporary test directory because the
process was still running in this directory.