multiprocessing module.

FreeBSD doesn't have socket.EAI_NODATA.  I rewrote the routine because
there's no easy way to conditionally include a context manager in a
with statement.  As a side benefit, instead of a stack of context
managers there's now only one.

If a body part ended with \r\n, feedparser, using '$' to terminate its
search for the newline, would match on the \r\n, and think that it needed
to strip two characters in order to account for the line end before the
boundary.  That made it chop one too many characters off the end of
the body part.  Using \Z makes the match correct.

Patch and test by Tony Nelson.

the curses module must be linked against ncurses as well. Otherwise it
is not safe to load both the readline and curses modules in an application.

Thanks Thomas Dickey for answering questions about ncurses/ncursesw
and readline!

for extracting symbolic and hard link entries as regular files as a
work-around on platforms that do not support filesystem links.

This stopped working reliably after a change in r74571. I also added
a few tests for this functionality.

field != 0 by mistake. The associated testcase did not
expose this bug because it was broken too.

honor the MacOSX SDK when one is specified.

This is needed to be able to build using the 10.4u SDK while running
on OSX 10.6.

This is a fixed version of the patch in r80963, I've tested this patch
on OSX and Linux.

Fixes (mysterious, to the end user) UnicodeErrors when using utf-8 as
the charset and unicode as the _text argument.  Also makes the way in
which unicode gets encoded to quoted printable for other charsets more
sane (it only worked by accident previously).  The _payload now is encoded
to the charset.output_charset if it is unicode.

default of unbuffered IO in subprocess.Popen.

False on MacOSX 10.5 or earlier and scripts won't be able to access GUI
functionality.

configured before attempting to test PlaySound.

Put docs for RegexObject.search() before RegexObject.match() to mirror re.search() and re.match() order.

and a complex instance.  Based on a patch by Meador Inge.

type.  Coercion for arithmetic operations was already removed in
r78280, but that commit didn't remove coercion for rich comparisons.

pipe communication into a loop to retry in case a buildbot gets even slower.

gaierror(EAI_NODATA)