Bug 647957 - GimpColorFrame's CMYK mode is not color managed
Convert GimpRGB to CMYK using a color transform to the configured CMYK profile instead of the naive gimp_rgb_to_cmyk(). Add gimp_color_frame_set_color_config() and call it on all color frames in the GUI (color picker tool, cursor info, sample point view). Keep a GimpColorTransform around that does the conversion. Also color manages the frame's color area now (visible in the sample point view), which was forgotten earlier. Addresses bug #467930.
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