Remove the SSLSocket versions of sendmsg/recvmsg due to lack of proper tests and documentation in conjunction with lack of any known use cases (see issue #6560 for details)

Patch written by Remi Pointel.

#12191: add shutil.chown() to change user and/or group owner of a given path also specifying their names.

#10542: Add 4 macros to work with surrogates: Py_UNICODE_IS_SURROGATE, Py_UNICODE_IS_HIGH_SURROGATE, Py_UNICODE_IS_LOW_SURROGATE, Py_UNICODE_JOIN_SURROGATES.

#9200: The str.is* methods now work with strings that contain non-BMP characters even in narrow Unicode builds.

Add support for the send/recvmsg API to the socket module. Patch by David Watson and Heiko Wundram. (Closes #6560)

Patch by Jeremy Kloth.

I need this to fix the failing test_command_install_dist.

I need this to fix the failing test_install.

sched_setparam() returning EINVAL for processes with SCHED_OTHER scheduling
policy.

 * Use str.startswith(tuple): I didn't know this Python feature, Python rocks!
 * Replace sometimes sys.platform.startswith('linux') with
   sys.platform == 'linux'
 * sys.platform doesn't contain the major version on Cygwin on Mac OS X
   (it's just 'cygwin' and 'darwin')

Copy/paste (from Python 3.2) failure

On Linux, sys.platform doesn't contain the major version anymore. It is now
always 'linux', instead of 'linux2' or 'linux3' depending on the Linux version
used to build Python.