plug-ins: add a color space parameter to file-j2k-load().
JPEG 2000 codestream doesn't have a header and guessing the color space in particular is not foolproof (especially when 3 or 4 components, which can be many spaces). Therefore the need of a parameter on the API. Note that JP2 images should always have the color space information. In interactive mode, I try to be a bit flexible to salvage broken JP2 with no color space information in the header, but I am not adding a parameter in file-jp2-load() (on purpose, since we are not going to add in the API a parameter for a case not supposed to happen with properly encoded files).
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