Allow to set profiles on grayscale images. Change profile validation
to check for image type and profile type. Actually the patch simply
makes some pieces of code less restrictive. Change user-visible
strings in the profile dialogs accordingly. Change PDB docs
accordingly.
to not return a reference that has to be dropped. Also allow NULL to
be returned if the managed cannot have a profile. If it can have one,
get_color_profile() still always returns a profile (either the
assigned one, or a generated built-in one).
Which will have proper API to deal with an image's color profile (no
parasites, no ICC blobs). So far contains gimp_image_get_color_profile()
and gimp_image_set_color_profile().