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Scan with only one component are by definition not interleaved, meaning that each value is linearly ordered in the stream. Grayscale images were supported thanks to a hack, by forcing the subsampling to 1. Now we properly support grayscale image with other subsampling (even if it doesn't make sense) and more generally scans with only one component and any sampling factors. While this solution is more general than the last one it also feels a bit hackish. We should probably refactor the way we iterate over components and macroblocks. But that's work for latter, especially when we will add support for other subsampling than 4-2-2.