* mln/labeling/compute.hh: Add a missing include.

	* mln/literal/colors.hh: Revamp header.

	* mln/value/internal/make_generic_name.hh: Add a missing inline.

	* mln/value/qt/rgb32.hh: Add a missing inline and a useless
	literal.

	* mln/value/rgb.hh: Add a fixme.