Also speed up slot_sq_item.

* add test to check if were modifying token

* copy list so import tokenize doesnt have side effects on token

* shorten line

* add tokenize tokens to token.h to get them to show up in token

* move ERRORTOKEN back to its previous location, and fix nitpick

* copy comments from token.h automatically

* fix whitespace and make more pythonic

* change to fix comments from @haypo

* update token.rst and Misc/NEWS

* change wording

* some more wording changes

Bugfix: This test wasn't being run because it was skipping based on the
presence of Py_ENABLE_SHARED rather than its value.  It is always present
on POSIX systems but defaults to 0.

Refactoring: Move the environment variables that can be ignored into a
function.  Parse the list from the child process and filter out the ones
to exclude in the parent before checking that the rest is empty.

Feature: Adds always present environment variables to ignore when
running in a Gentoo sandbox so that the test can pass there.

Replace `an ModuleNotFoundError` with `a ModuleNotFoundError`.
Replace `an path` with `a path`.

Instead use keyword only arguments to os.register_at_fork for each of the scenarios.
Updates the documentation for clarity.

Rather than saving the Python object and calling PyObject_IsTrue()
every time when the boolean argument is used, call it only once and
save C boolean value.

* bpo-16500: Use register_at_fork() in the threading module

* Update comment at top of _after_fork()

Patch by Cheryl Sabella.

* Doc nits for bpo-16500

* Fix more references

Coverage is now 100%

* bpo-30492: Allow make clinic to work out of tree.

* Use os.curdir instead of "." as the default value.

Patch by Cheryl Sabella.

Extension modules listed after the *disabled* marker are not built at all,
neither by the Makefile nor by setup.py.

* bpo-16500: Allow registering at-fork handlers

* Address Serhiy's comments

* Add doc for new C API

* Add doc for new Python-facing function

* Add NEWS entry + doc nit

Calling Ctypes functions is deprecated in 3.6.2 and will be removed in 3.7

Also document that some attributes may be None.

Unlikely to the simplejson module, json.JSONDecodeError doesn't accept the end argument.

The "iterable iterable" phrasing created confusion between the term
reference and the parameter name.

This simplifies the phrasing to just use the parameter name
without linking directly to the term definition.

* correct __slots__ documentation with minimal changes

* add multiple inheritance info

* remove mapping from description

Partially clarify the subprocess convenience API documentation by
explicitly listing the `cwd` parameter in their abbreviated signatures.

While this has been merged as an improvement, it doesn't fully
resolve the issue, as the `cwd` should also be covered in the
"Frequently Used Arguments" section, and the fact these APIs
pass unlisted keyword arguments down to the lower level APIs
is currently still unclear.

* bpo-30414: multiprocesing.Queue._feed do not break from main loop on exc

Queue background running thread was not handling exceptions correctly.
Any exception occurred inside thread (putting unpickable object) cause
feeder to finish running. After that every message put into queue is
silently ignored.

* bpo-30414: multiprocesing.Queue._feed do not break from main loop on exc

Queue background running thread was not handling exceptions correctly.
Any exception occurred inside thread (putting unpickable object) cause
feeder to finish running. After that every message put into queue is
silently ignored.

Running under coverage sometimes causes 'in comparison' to be added to the end of the RecursionError message, which is acceptable.

Patched by Maria Mckinley

Clean up `Misc/README.AIX` for addressed known issues.

- Issues that have been marked fixed: #11184, #11185
- Issues resolved by new AIX version: #1745108
- Issues resolved, but not yet marked fixed/closed: #11188
Signed-off-by: Eric N. Vander Weele <ericvw@gmail.com>