2005-10-11  Michael Natterer  <mitch@gimp.org>

	* libgimpthumb/gimpthumbnail.c: the mime-type is stored in
	"tEXt::Thumb::Mimetype", not in "tEXt::Thumb::Image::Mimetype".
	Fixed this and reordered properties so "tEXt::Thumb" and
	"tEXt::Thumb::Image" stuff is grouped together again.