Subprocess32

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* Fixes issue 15798: subprocess.Popen() no longer fails if file
descriptor 0, 1 or 2 is closed.
* Fixes issue 18763: close_fd file descriptors are now closed after
any preexec_fn call.

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* Fixes issue 16650 - Don't reference ECHILD from outside the local scope.
* Unittests no longer spew any test data for human verification to stdout.
* Remove a bare print to stdout that could have happened if the child process
wrote garbage to its pre-exec error pipe.
* Fixes issue 16327 - the subprocess module no longer leaks file descriptors
used for stdin/stdout/stderr pipes to the child when the fork() fails. It
also no longer potentially double closes these pipe fds.
* Correct the Python version check around use of imp_module to specify 2.6.3
as the minimum version that exists in. Why is anyone using such an old 2.6?
* Fixes Issue 16114: The subprocess module no longer provides a misleading
error message stating that args[0] did not exist when either the cwd or
executable keyword arguments specified a path that did not exist.
* Add more Popen cwd tests.
* Handle errno.ECHILD in poll.
* Don't leak a reference to the gc module on capi use error.
* Check return value to avoid a crash if the capi were misused.
* Check result of PyObject_IsTrue().
* Adds test_universal_newlines_communicate_input_none.
* Most everything above consists of backports. See the hg logs for their
upstream hg.python.org cpython revision numbers.

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* Fixes the references to the 'surrogateescape' unicode encoding error
handler that does not exist in Python 2.x. 'strict' is used so that
a UnicodeEncodeError exception is raised in these situations. These
MAY occur if your sys.getfilesystemencoding() is not UTF-8 and
attempt to use a non-ascii executable, args or env values. Prior to
this change, those would result in a hard to debug LookupError for
surrogateescape.
* Issue 15000: Support the "unique" x32 architecture in _posixsubprocess.c.
* Fix a compilation problem when O_CLOEXEC is not defined.

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This release brings in the last year and a half's worth of bugfixes and
improvements to Python 3.2's subprocess module:

Off the top of my head, some major bugfix highlights include:
* Timeout support on the APIs.
* close_fds=True is now the default (as it is in 3.2) and performs much faster.
* Fixed EINTR handling.
* Fixed SIGCHLD handling.
* Fixed several race conditions.
* Many more bug fixes too numerous to list.

You can grep out the full list of improvements related to subprocess in:
http://hg.python.org/cpython/file/9ce5d456138b/Misc/NEWS

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This was the first release. Roughly equivalent to Python 3.2.0a1.