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/Python/dynload_aix.c b/Python/dynload_aix.c
index 9c6b60a..04e6293 100644
--- a/Python/dynload_aix.c
+++ b/Python/dynload_aix.c
@@ -189,7 +189,7 @@
 	/*
 	-- Invoke load() with L_NOAUTODEFER leaving the imported symbols
 	-- of the shared module unresolved. Thus we have to resolve them
-	-- explicitely with loadbind. The new module is loaded, then we
+	-- explicitly with loadbind. The new module is loaded, then we
 	-- resolve its symbols using the list of already loaded modules
 	-- (only those that belong to the python executable). Get these
 	-- with loadquery(L_GETINFO).