[Image-SIG] YUYV support for PIL

[David Turner]

I have written YUYV support for PIL.  YUYV is a format widely used by
crappy webcams.  It's 32 bits for 2 pixels.  The pixels have their own Y
values, but share U and V values.  A patch is attached.

I think it might be possible to add this in pure Python, but I could not
figure out how from the documentation.  Could someone help, so that I
could use PIL before the next release? 

I tested it with my crappy webcam (04f2:b018 Chicony Electronics Co.,
Ltd), and it worked.  
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