Forward port rest of NEWS changes as of 3.7.0

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+.. bpo: 33363
+.. date: 2018-04-26-22-48-28
+.. nonce: 8RCnN2
+.. release date: 2018-05-02
+.. section: Core and Builtins
+
+Raise a SyntaxError for ``async with`` and ``async for`` statements outside
+of async functions.
+
+..
+
+.. bpo: 33128
+.. date: 2018-04-24-22-31-04
+.. nonce: g2yLuf
+.. section: Core and Builtins
+
+Fix a bug that causes PathFinder to appear twice on sys.meta_path. Patch by
+Pablo Galindo Salgado.
+
+..
+
+.. bpo: 33312
+.. date: 2018-04-19-08-30-07
+.. nonce: mDe2iL
+.. section: Core and Builtins
+
+Fixed clang ubsan (undefined behavior sanitizer) warnings in dictobject.c by
+adjusting how the internal struct _dictkeysobject shared keys structure is
+declared.
+
+..
+
+.. bpo: 33231
+.. date: 2018-04-05-22-20-44
+.. nonce: 3Jmo0q
+.. section: Core and Builtins
+
+Fix potential memory leak in ``normalizestring()``.
+
+..
+
+.. bpo: 33205
+.. date: 2018-04-03-00-58-41
+.. nonce: lk2F3r
+.. section: Core and Builtins
+
+Change dict growth function from
+``round_up_to_power_2(used*2+hashtable_size/2)`` to
+``round_up_to_power_2(used*3)``.  Previously, dict is shrinked only when
+``used == 0``. Now dict has more chance to be shrinked.
+
+..
+
+.. bpo: 29922
+.. date: 2018-04-03-00-30-25
+.. nonce: CdLuMl
+.. section: Core and Builtins
+
+Improved error messages in 'async with' when ``__aenter__()`` or
+``__aexit__()`` return non-awaitable object.
+
+..
+
+.. bpo: 33199
+.. date: 2018-04-02-09-32-40
+.. nonce: TPnxQu
+.. section: Core and Builtins
+
+Fix ``ma_version_tag`` in dict implementation is uninitialized when copying
+from key-sharing dict.
+
+..
+
+.. bpo: 33281
+.. date: 2018-05-01-22-35-50
+.. nonce: d4jOt4
+.. section: Library
+
+Fix ctypes.util.find_library regression on macOS.
+
+..
+
+.. bpo: 33383
+.. date: 2018-04-29-11-15-38
+.. nonce: g32YWn
+.. section: Library
+
+Fixed crash in the get() method of the :mod:`dbm.ndbm` database object when
+it is called with a single argument.
+
+..
+
+.. bpo: 33329
+.. date: 2018-04-23-13-21-39
+.. nonce: lQ-Eod
+.. section: Library
+
+Fix multiprocessing regression on newer glibcs
+
+..
+
+.. bpo: 991266
+.. date: 2018-04-21-00-24-08
+.. nonce: h93TP_
+.. section: Library
+
+Fix quoting of the ``Comment`` attribute of
+:class:`http.cookies.SimpleCookie`.
+
+..
+
+.. bpo: 33131
+.. date: 2018-04-20-10-43-17
+.. nonce: L2E977
+.. section: Library
+
+Upgrade bundled version of pip to 10.0.1.
+
+..
+
+.. bpo: 33308
+.. date: 2018-04-18-19-12-25
+.. nonce: fW75xi
+.. section: Library
+
+Fixed a crash in the :mod:`parser` module when converting an ST object to a
+tree of tuples or lists with ``line_info=False`` and ``col_info=True``.
+
+..
+
+.. bpo: 33266
+.. date: 2018-04-16-15-59-21
+.. nonce: w2PAm-
+.. section: Library
+
+lib2to3 now recognizes ``rf'...'`` strings.
+
+..
+
+.. bpo: 11594
+.. date: 2018-04-16-08-42-03
+.. nonce: QLo4vv
+.. section: Library
+
+Ensure line-endings are respected when using lib2to3.
+
+..
+
+.. bpo: 33254
+.. date: 2018-04-13-15-14-47
+.. nonce: DS4KFK
+.. section: Library
+
+Have :func:`importlib.resources.contents` and
+:meth:`importlib.abc.ResourceReader.contents` return an :term:`iterable`
+instead of an :term:`iterator`.
+
+..
+
+.. bpo: 33256
+.. date: 2018-04-10-20-57-14
+.. nonce: ndHkqu
+.. section: Library
+
+Fix display of ``<module>`` call in the html produced by ``cgitb.html()``.
+Patch by Stéphane Blondon.
+
+..
+
+.. bpo: 33185
+.. date: 2018-04-08-22-54-07
+.. nonce: Id-Ba9
+.. section: Library
+
+Fixed regression when running pydoc with the :option:`-m` switch. (The
+regression was introduced in 3.7.0b3 by the resolution of :issue:`33053`)
+
+This fix also changed pydoc to add ``os.getcwd()`` to :data:`sys.path` when
+necessary, rather than adding ``"."``.
+
+..
+
+.. bpo: 33169
+.. date: 2018-04-06-14-56-26
+.. nonce: ByhDqb
+.. section: Library
+
+Delete entries of ``None`` in :data:`sys.path_importer_cache` when
+:meth:`importlib.machinery.invalidate_caches` is called.
+
+..
+
+.. bpo: 33217
+.. date: 2018-04-05-13-36-09
+.. nonce: FfOKDI
+.. section: Library
+
+Deprecate looking up non-Enum objects in Enum classes and Enum members (will
+raise :exc:`TypeError` in 3.8+).
+
+..
+
+.. bpo: 33203
+.. date: 2018-04-05-11-09-45
+.. nonce: Hje9Py
+.. section: Library
+
+``random.Random.choice()`` now raises ``IndexError`` for empty sequences
+consistently even when called from subclasses without a ``getrandbits()``
+implementation.
+
+..
+
+.. bpo: 33224
+.. date: 2018-04-04-23-41-30
+.. nonce: pyR0jB
+.. section: Library
+
+Update difflib.mdiff() for PEP 479.  Convert an uncaught StopIteration in a
+generator into a return-statement.
+
+..
+
+.. bpo: 33209
+.. date: 2018-04-03-10-37-13
+.. nonce: 9sGWE_
+.. section: Library
+
+End framing at the end of C implementation of :func:`pickle.Pickler.dump`.
+
+..
+
+.. bpo: 20104
+.. date: 2018-04-01-19-21-04
+.. nonce: -AKcGa
+.. section: Library
+
+Improved error handling and fixed a reference leak in
+:func:`os.posix_spawn()`.
+
+..
+
+.. bpo: 33175
+.. date: 2018-03-29-04-32-25
+.. nonce: _zs1yM
+.. section: Library
+
+In dataclasses, Field.__set_name__ now looks up the __set_name__ special
+method on the class, not the instance, of the default value.
+
+..
+
+.. bpo: 33097
+.. date: 2018-03-18-16-48-23
+.. nonce: Yl4gI2
+.. section: Library
+
+Raise RuntimeError when ``executor.submit`` is called during interpreter
+shutdown.
+
+..
+
+.. bpo: 31908
+.. date: 2017-10-31
+.. nonce: g4xh8x
+.. section: Library
+
+Fix output of cover files for ``trace`` module command-line tool. Previously
+emitted cover files only when ``--missing`` option was used. Patch by
+Michael Selik.
+
+..
+
+.. bpo: 33378
+.. date: 2018-04-29-04-02-18
+.. nonce: -anAHN
+.. section: Documentation
+
+Add Korean language switcher for https://docs.python.org/3/
+
+..
+
+.. bpo: 33276
+.. date: 2018-04-20-14-09-36
+.. nonce: rA1z_3
+.. section: Documentation
+
+Clarify that the ``__path__`` attribute on modules cannot be just any value.
+
+..
+
+.. bpo: 33201
+.. date: 2018-04-01-21-03-41
+.. nonce: aa8Lkl
+.. section: Documentation
+
+Modernize documentation for writing C extension types.
+
+..
+
+.. bpo: 33195
+.. date: 2018-04-01-14-30-36
+.. nonce: dRS-XX
+.. section: Documentation
+
+Deprecate ``Py_UNICODE`` usage in ``c-api/arg`` document. ``Py_UNICODE``
+related APIs are deprecated since Python 3.3, but it is missed in the
+document.
+
+..
+
+.. bpo: 8243
+.. date: 2018-01-13-20-30-53
+.. nonce: s98r28
+.. section: Documentation
+
+Add a note about curses.addch and curses.addstr exception behavior when
+writing outside a window, or pad.
+
+..
+
+.. bpo: 32337
+.. date: 2017-12-22-17-29-37
+.. nonce: eZe-ID
+.. section: Documentation
+
+Update documentation related with ``dict`` order.
+
+..
+
+.. bpo: 33358
+.. date: 2018-04-27-11-46-35
+.. nonce: _OcR59
+.. section: Tests
+
+Fix ``test_embed.test_pre_initialization_sys_options()`` when the
+interpreter is built with ``--enable-shared``.
+
+..
+
+.. bpo: 33394
+.. date: 2018-04-30-17-36-46
+.. nonce: _Vdi4t
+.. section: Build
+
+Enable the verbose build for extension modules, when GNU make is passed
+macros on the command line.
+
+..
+
+.. bpo: 33393
+.. date: 2018-04-30-17-19-37
+.. nonce: HkVCqI
+.. section: Build
+
+Update config.guess and config.sub files.
+
+..
+
+.. bpo: 33377
+.. date: 2018-04-30-16-53-00
+.. nonce: QBh6vP
+.. section: Build
+
+Add new triplets for mips r6 and riscv variants (used in extension
+suffixes).
+
+..
+
+.. bpo: 32232
+.. date: 2018-04-17-00-38-19
+.. nonce: o7G_UO
+.. section: Build
+
+By default, modules configured in `Modules/Setup` are no longer built with
+`-DPy_BUILD_CORE`. Instead, modules that specifically need that preprocessor
+definition include it in their individual entries.
+
+..
+
+.. bpo: 33182
+.. date: 2018-03-30-14-55-48
+.. nonce: CePczb
+.. section: Build
+
+The embedding tests can once again be built with clang 6.0
+
+..
+
+.. bpo: 33184
+.. date: 2018-04-13-11-28-55
+.. nonce: 7YhqQE
+.. section: Windows
+
+Update Windows installer to use OpenSSL 1.1.0h.
+
+..
+
+.. bpo: 33184
+.. date: 2018-04-07-00-51-34
+.. nonce: 3j208P
+.. section: macOS
+
+Update macOS installer build to use OpenSSL 1.1.0h.
+
+..
+
+.. bpo: 21474
+.. date: 2018-04-29-16-13-02
+.. nonce: bglg-F
+.. section: IDLE
+
+Update word/identifier definition from ascii to unicode. In text and entry
+boxes, this affects selection by double-click, movement left/right by
+control-left/right, and deletion left/right by control-BACKSPACE/DEL.
+
+..
+
+.. bpo: 33204
+.. date: 2018-04-02-00-28-13
+.. nonce: NBsuIv
+.. section: IDLE
+
+IDLE: consistently color invalid string prefixes. A 'u' string prefix cannot
+be paired with either 'r' or 'f'. Consistently color as much of the prefix,
+starting at the right, as is valid. Revise and extend colorizer test.
+
+..
+
+.. bpo: 33189
+.. date: 2018-04-03-18-10-00
+.. nonce: QrXR00
+.. section: Tools/Demos
+
+:program:`pygettext.py` now recognizes only literal strings as docstrings
+and translatable strings, and rejects bytes literals and f-string
+expressions.
+
+..
+
+.. bpo: 31920
+.. date: 2018-03-26-18-54-24
+.. nonce: u_WKsT
+.. section: Tools/Demos
+
+Fixed handling directories as arguments in the ``pygettext`` script. Based
+on patch by Oleg Krasnikov.
+
+..
+
+.. bpo: 29673
+.. date: 2018-03-16-17-25-05
+.. nonce: m8QtaW
+.. section: Tools/Demos
+
+Fix pystackv and pystack gdbinit macros.
+
+..
+
+.. bpo: 31583
+.. date: 2017-09-26-10-11-21
+.. nonce: TM90_H
+.. section: Tools/Demos
+
+Fix 2to3 for using with --add-suffix option but without --output-dir option
+for relative path to files in current directory.