theora dev - Oct 2009 - Totally untested patch for cropping in Jheora

The attached patch attempts to implement Theora's cropping frame in
Cortado.  I make no claim that it is likely to work, as I have no clue how
to build and test Jheora/Cortado.  Please test.  Thank you.

I can at least confirm that CropImageFilter and FilteredImageSource were
present in JDK 1.1.

Performance impact in the absence of cropping should be negligible.  With
cropping, there might be a significant performance penalty.  I have no idea.

--Ben
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