Include Марк Коренберг and Steffen Daode Nurpmeso in Mist/ACKS for contributions in issues 11265 and 11351.

Mentioned new clear() method of MutableSequence in its doc, and added unit tests for its mixin methods

Issue 9795: adds context manager protocol to nntplib.NNTP class so that it can used with the 'with' statement.

Issue 11351 - apply patch by Steffen Daode Nurpmeso which should fix TestSendfile.test_headers failure on OSX.

Fix issue 11265: asyncore now correctly handles EPIPE, EBADF and EAGAIN errors on accept(), recv() and send().

Thanks to Mark Smith for the patch.

When a string is encoded to UTF-8 in strict mode, the result is cached into the
object. Examples: str.encode(), str.encode('utf-8'), PyUnicode_AsUTF8String()
and PyUnicode_AsEncodedString(unicode, "utf-8", NULL).

Apart from distutils itself, the stdlib has now officially switched to
the new top-level sysconfig module.  Patch greenlighted by Ned Deily.

 * Use the same function to parse the format string in the 3 steps
 * Fix crashs on invalid format strings

Patch written by Pierre Quentel

Patch by Aymeric Augustin.

Decode the byte string from UTF-8 (with replace error handler) instead of
ISO-8859-1 (in strict mode). Patch written by Ray Allen.

The doc already points to argparse.

and improve wording.

to release an unacquired lock, as claimed in the threading documentation.
The _thread.error exception is now an alias of RuntimeError.