Under  *spawn* and *forkserver* start methods, SimpleQueue.empty() could
raise AttributeError due to not setting _poll in __setstate__.

Before, it was possible to get the following sequence of
events (especially on Windows, where the C-level signal handler for
SIGINT is run in a separate thread):

- SIGINT arrives
- trip_signal is called
- trip_signal writes to the wakeup fd
- the main thread wakes up from select()-or-equivalent
- the main thread checks for pending signals, but doesn't see any
- the main thread drains the wakeup fd
- the main thread goes back to sleep
- trip_signal sets is_tripped=1 and calls Py_AddPendingCall to notify
  the main thread the it should run the Python-level signal handler
- the main thread doesn't notice because it's asleep

This has been causing repeated failures in the Trio test suite:
  https://github.com/python-trio/trio/issues/119

* Use explicit numbering for footnotes referred by explicit number.
* Restore missed footnote reference in stdtypes.rst.
* Fix literal strings formatting in howto/urllib2.rst.
* Update susp-ignored.csv for zipapp.rst.
* Fix suspicious mark up in Misc/NEWS.

Warnings emitted when compile a regular expression now always point
to the line in the user code.  Previously they could point into inners
of the re module if emitted from inside of groups or conditionals.

It should read PYTHONLEGACYWINDOWSSTDIO as stated
in section "Add legacy mode" in PEP 528.

test_multiprocessing_main_handling: increase the test_source timeout
from 10 seconds to 60 seconds, since the test fails randomly on busy
buildbots.

test_thread: setUp() now uses support.threading_setup() and
support.threading_cleanup() to wait until threads complete to avoid
random side effects on following tests.
Co-Authored-By: Grzegorz Grzywacz <grzegorz.grzywacz@nazwa.pl>

Catch the Windows socket WSAEINVAL error (code 10022) in imaplib and
poplib on shutdown(SHUT_RDWR): An invalid operation was attempted

This error occurs sometimes on SSL connections.

in the plistlib module.  Dict values in the result of functions
readPlist() and readPlistFromBytes() are now exact dicts.

Co-Authored-By: Chi Hsuan Yen <yan12125@gmail.com>.

The data model section of the language reference was written well
before the zero-argument form of super() was added.

To avoid giving the impression that they're doing something
unusual, this updates the description of `__new__` and `__init__`
to use the zero-argument form.

Patch by Cheryl Sabella.

`re.compile(..., re.DEBUG)` now displays the compiled bytecode in
human readable form.

This increased the performance of matching some patterns up to 25 times.

rather than `format(str(self), '')`.

* add a comment about why we need to increase trash_delete_nesting
* move increase and decrese outside of the loop

Using a response file will eliminate the headache associated with batch argument/quote processing.

For example I unsucessfully compiled python with visualcpptools when specifying VSInstallDir in the batch file (cannot find vcruntime.h)

```batch
build.bat -p x64 -e -M --no-tkinter  "/p:VCInstallDir=%VCInstallDir%"
```

but it build successfully when specifying it in a response file

msbuild.rsp:
```
/p:VCInstallDir=%VCInstallDir%
```

bpo-30291 Changes to launcher so as to allow py -3-32, -2.7-64, 3.10, etc.

Indented parts of the Handler class documentation for improved presentation, analogous to a recent similar change for the Logger class.

* bpo-30308: Code coverage for argument in random.shuffle

* bpo-30308: Code coverage for argument in random.shuffle

* bpo-30308: Code coverage for argument in random.shuffle

when there are no more `await` or `yield (from)` before return in coroutine,
cancel was ignored.

example:

    async def coro():
        asyncio.Task.current_task().cancel()
        return 42
    ...
    res = await coro()  # should raise CancelledError

* bpo-28787: Fix out of tree --with-dtrace builds

* Unsilence directory creation

* Add Misc/NEWS and Misc/ACKS entries

Now allowed several subsequential inline modifiers at the start of the
pattern (e.g. '(?i)(?s)...').  In verbose mode whitespaces and comments
now are allowed before and between inline modifiers (e.g.
'(?x) (?i) (?s)...').

Rewrite sigwaitinfo() and sigtimedwait() unit tests for EINTR using
pthread_sigmask() to fix a race condition between the child and the
parent process.

Remove the pipe which was used as a weak workaround against the race
condition.

sigtimedwait() is now tested with a child process sending a signal
instead of testing the timeout feature which is more unstable
(especially regarding to clock resolution depending on the platform).