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.

Lib/test/test_popen2.py

@@ -35,6 +35,9 @@ def _test():
     # same test as popen2._test(), but using the os.popen*() API
     print "Testing os module:"
     import popen2
+    # When the test runs, there shouldn't be any open pipes
+    popen2._cleanup()
+    assert not popen2._active, "Active pipes when test starts " + repr([c.cmd for c in popen2._active])
     cmd  = "cat"
     teststr = "ab cd\n"
     if os.name == "nt":
@@ -65,6 +68,7 @@ def _test():
         raise ValueError("unexpected %r on stderr" % (got,))
     for inst in popen2._active[:]:
         inst.wait()
+    popen2._cleanup()
     if popen2._active:
         raise ValueError("_active not empty")
     print "All OK"