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/Demo/sgi/video/Vrec.py b/Demo/sgi/video/Vrec.py
index b647bd3..11039bb 100755
--- a/Demo/sgi/video/Vrec.py
+++ b/Demo/sgi/video/Vrec.py
@@ -26,7 +26,7 @@
 	print '-g bits       : greyscale (2, 4 or 8 bits)'
 	print '-G            : 2-bit greyscale dithered'
 	print '-m            : monochrome dithered'
-	print '-M value      : monochrome tresholded with value'
+	print '-M value      : monochrome thresholded with value'
 	print '-f            : Capture fields (in stead of frames)'
 	print '-P frames     : preallocate space for "frames" frames'
 	print 'moviefile     : here goes the movie data (default film.video)'