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.
diff --git a/Modules/_tkinter.c b/Modules/_tkinter.c
index e8efaa7..c17b6c6 100644
--- a/Modules/_tkinter.c
+++ b/Modules/_tkinter.c
@@ -647,7 +647,7 @@
 
 	strcpy(argv0, className);
 	if (isupper(Py_CHARMASK(argv0[0])))
-		argv0[0] = tolower(argv0[0]);
+		argv0[0] = tolower(Py_CHARMASK(argv0[0]));
 	Tcl_SetVar(v->interp, "argv0", argv0, TCL_GLOBAL_ONLY);
 	ckfree(argv0);