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/pythonrun.c b/Python/pythonrun.c
index afb9589..cc942a3 100644
--- a/Python/pythonrun.c
+++ b/Python/pythonrun.c
@@ -75,7 +75,7 @@
 
 static int initialized = 0;
 
-/* API to access the initialized flag -- useful for eroteric use */
+/* API to access the initialized flag -- useful for esoteric use */
 
 int
 Py_IsInitialized()