Issue #16893: For Idle doc, move index entries, copy no-subprocess section
from idlelib/help.txt, add 'C' comment, and remove obsolete ^Z comment
Original patch by Zach Ware.

--HG--
branch : 3.4
Issue #3068: Document the new Configure Extensions dialog and menu entry.

--HG--
branch : 3.4
asyncio: Initialize more Future and Task attributes in the class definition to
avoid attribute errors in destructors.

--HG--
branch : 3.4
Issue #22685: Fix test_pause_reading() of asyncio test_subprocess

* mock also resume_reading()
* ensure that resume_reading() is called

--HG--
branch : 3.4
Closes #22922: More EventLoop methods fail if the loop is closed. Initial patch
written by Torsten Landschoff.

create_task(), call_at(), call_soon(), call_soon_threadsafe() and
run_in_executor() now raise an error if the event loop is closed.

--HG--
branch : 3.4
Issue #22922: Fix ProactorEventLoop.close()

Call _stop_accept_futures() before sestting the _closed attribute, otherwise
call_soon() raises an error.

--HG--
branch : 3.4
Closes #22429, asyncio: Fix EventLoop.run_until_complete(), don't stop the
event loop if a BaseException is raised, because the event loop is already
stopped.

--HG--
branch : 3.4