Update TreeFlower 3 artistic motif directory structure:
    
        - Move `TreeFlower/3/Distro/5.5/Media' up to `TreeFlower/3/Media'
          and remove `TreeFlower/3/Disto/5.5' directory.
    
        - Installation media images, based on TreeFlower 3 artistic motif,
          are rendered using the
          `trunk/Identity/Images/Themes/TreeFlower/3/Media' directory as
          source and the `--releasever' and `--basearch' options to
          control the release and architecture the images are produced
          for.