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/flmodule.c b/Modules/flmodule.c
index 5b88be5..e2aa6a1 100644
--- a/Modules/flmodule.c
+++ b/Modules/flmodule.c
@@ -22,7 +22,7 @@
  * fine but a program with two threads using forms will probably crash (unless
  * the program takes precaution to ensure that only one thread can be in
  * this module at any time). This will have to be fixed some time.
- * (A fix will probably also have to synchronise with the gl module).
+ * (A fix will probably also have to synchronize with the gl module).
  */
 
 #include "Python.h"