bpo-29463 added optional "docstring" field to 4 AST types.
While it is optional, it breaks backward compatibility because AST constructor
requires number of positional argument is same to number of fields.

AST types accepts empty arguments, and incomplete keyword arguments.
But it's not big problem because field can be filled after creation, and checked when compiling.
So stop requiring complete set of fields for positional arguments too.

Add a comment to prevent further attempts to avoid a copy for
optimization.

When you use `'%s' % SubClassOfStr()`, where `SubClassOfStr.__rmod__` exists, the reverse operation is ignored as normally such string formatting operations use the `PyUnicode_Format()` fast path. This patch tests for subclasses of `str` first and picks the slow path in that case.

Patch by Martijn Pieters.

* bpo-29463: Add docstring field to some AST nodes.

ClassDef, ModuleDef, FunctionDef, and AsyncFunctionDef has docstring
field for now.  It was first statement of there body.

* fix document.  thanks travis!

* doc fixes

bpo-29546: Improve from-import error message with location

sock_addr_t is used to define the minimum size of any socket address on
the stack. Let's make sure that an AF_ALG address always fits. Coverity
complains because in theory, AF_ALG might be larger than any of the other
structs. In practice it already fits.

Closes Coverity CID 1398948, 1398949, 1398950
Signed-off-by: Christian Heimes <christian@python.org>

Nick Coghlan said on bpo-28814:

> inspect.getargvalues() and inspect.formatargvalues() were deprecated
> in Python 3.5 as part of implementing bpo-20438

> This is incorrect, as these are *frame* introspection related functions,
> not callable introspection ones. The documentation and implementation
> layout is confusing though, as they're interleaved with the callable
> introspection operation

This commit undeprecates these functions and adds a note to ignore
previous deprecation notices.

PyObject_GetAttrString intern temporary key string.
It's completely redudant.

use "union" merge strategy for Misc/NEWS.

As of Python 3.6 **kwargs are ordered, thus, remove the paragraph stating that
ordering is undefined and change snippet to remove the unecessary sorted call.

* Add sentence mentioning guaranteed output order of kwargs

Clarify that methods take a string which is interpreted as a regex,
not a regex object.

Also clarify what the old `-1`, `0`, `1` and `2` options were.

* Fix incorrect handling of signed zeros for complex-related classes.

* Add Misc/NEWS entry.

lookdict_unicode() and lookdict_unicode_nodummy() may raise exception
when key is not unicode.

no longer affects a partial object after creation.

3eea8c67 missed dot at the end of paragraph.

* Fixed bpo-29565: Corrected ctypes passing of large structs by value.

Added code and test to check that when a structure passed by value
is large enough to need to be passed by reference, a copy of the
original structure is passed. The callee updates the passed-in value,
and the test verifies that the caller's copy is unchanged. A similar
change was also added to the test added for bpo-20160 (that test was
passing, but the changes should guard against regressions).

* Reverted unintended whitespace changes.

* Drop duplicate work 'object' in lzma docs
* Fix typo in os docs: fpr -> for

bpo-22807: Expose platform UUID generation safety information.

``local.getlocale(locale.LC_CTYPE)`` and
``locale.getpreferredencoding(False)`` may give different answers
in some cases (such as the ``en_IN`` locale).

``re.LOCALE`` uses the latter, so update the test case to match.

* bpo-29026: Clarity documentation of time.time

Clarify the documentation of time.time by more
precisely defining what is meant by "seconds since
the epoch" on most platforms. Additionally explain
how gmtime and localtime may be used to extract
calendar components and convert to a more common
date format.

* bpo-29026: Minor improvements for time.time doc

* bpo-29026: Consistency fixes for time.time doc

bltinmodule.c: Added in b744ba1d and no longer necessary since d64e8a75
posixmodule.c: Added in d1cd4d41 and no longer necessary since efb00c0c
pythonrun.c:   Added in 73d538b9 and no longer necessary since d6009517
sysmodule.c:   Added in 5467d4c0 and no longer necessary since a2c17c58