Merge p3yk branch with the trunk up to revision 45595. This breaks a fair

number of tests, all because of the codecs/_multibytecodecs issue described
here (it's not a Py3K issue, just something Py3K discovers):
http://mail.python.org/pipermail/python-dev/2006-April/064051.html

Hye-Shik Chang promised to look for a fix, so no need to fix it here. The
tests that are expected to break are:

test_codecencodings_cn
test_codecencodings_hk
test_codecencodings_jp
test_codecencodings_kr
test_codecencodings_tw
test_codecs
test_multibytecodec

This merge fixes an actual test failure (test_weakref) in this branch,
though, so I believe merging is the right thing to do anyway.

Doc/lib/libthread.tex

@@ -100,6 +100,19 @@ Return the status of the lock:\ \code{True} if it has been acquired by
 some thread, \code{False} if not.
 \end{methoddesc}
 
+In addition to these methods, lock objects can also be used via the
+\keyword{with} statement, e.g.:
+
+\begin{verbatim}
+from __future__ import with_statement
+import thread
+
+a_lock = thread.allocate_lock()
+
+with a_lock:
+    print "a_lock is locked while this executes"
+\end{verbatim}
+
 \strong{Caveats:}
 
 \begin{itemize}