Fix error in sheet generation that didn't do spillovers correctly for sheets that were not on the first 1024x1024 part.
Fix error in sheet generation that didn't do spillovers correctly for sheets that were not on the first 1024x1024 part.

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Imported from Google Code.
Original SVN rev#: 286

blakeohare/crayon,blakeohare/crayon,blakeohare/crayon,blakeohare/crayon,blakeohare/crayon,blakeohare/crayon,blakeohare/crayon,blakeohare/crayon