plug-ins: open a dialog to select color space of JPEG 2000 codestream.
JPEG 2000 codestream (.j2k/.j2c) are only compressed code stream data, without header. In particular we don't have color information, such as the color space. So we need to open a dialog asking to set the color space in interactive mode. Note: according to OpenJPEG developers, a JP2 image (not codestream) should always have a color space defined in its header. But just to be flexible, the same dialog may get raised as well if we try to load a JP2 with no valid color space defined in header and no ICC profile embedded. Maybe if such a thing happened, it means the image is corrupt, yet we may as well try and salvage it anyway. Note 2: I also removed a weird test which was setting some images as being YUV color space by mistake. This actually fixes bug 794413 as a side effect.
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