Spelling fixes supplied by Rob W. W. Hooft. All these are fixes in either
comments, docstrings or error messages. I fixed two minor things in
test_winreg.py ("didn't" -> "Didn't" and "Didnt" -> "Didn't").

There is a minor style issue involved: Guido seems to have preferred English
grammar (behaviour, honour) in a couple places. This patch changes that to
American, which is the more prominent style in the source. I prefer English
myself, so if English is preferred, I'd be happy to supply a patch myself ;)
diff --git a/Modules/cStringIO.c b/Modules/cStringIO.c
index 321e79b..bda60dd 100644
--- a/Modules/cStringIO.c
+++ b/Modules/cStringIO.c
@@ -57,7 +57,7 @@
 "This module provides a simple useful replacement for\n"
 "the StringIO module that is written in C.  It does not provide the\n"
 "full generality of StringIO, but it provides enough for most\n"
-"applications and is especially useful in conjuction with the\n"
+"applications and is especially useful in conjunction with the\n"
 "pickle module.\n"
 "\n"
 "Usage:\n"