Update `Default' theme design models:
    
        - Add `branding.conf' file.
    
        - Remove all branding information from design models. From now on,
          branding information is set through the `branding.conf' file.
          When the `branding.conf' file is used, branding information is
          taken from `trunk/Identity/Images/Brands' directory structure
          and overlapped on images as defined by `branding.conf' file.
          The overlapping action itself takes place through ImageMagick
          `composite' command. The ImageMagick `composite' command takes
          its arguments from `branding.conf' and is applied (as
          post-rendition action) to all rendered images, one by one.
    
        - Replace the `The CentOS Project' phrase to
          `=COPYRIGHT_HOLDER_PREDICATE=' translation marker on copyright
          notices and `=COPYRIGHT_HOLDER=' outside copyright notices.
    
        - Start using `=LICENSE=' and `=LICENSE_URL=' translation markers
          instead of `Creative Common Attribution-ShareAlike 3.0 License'
          and `http://creativecommons.org/licenses/by-sa/3.0/',
          respectively.
    
        - Don't use a minus sign between `CentOS' and `=RELEASE=', and try
          to be consistent on that. There is no minus sign in the branding
          information, so we don't use it when writing neither.
    
        - Remove `release.svg' from `Distro/5/Gdm' and `Distro/5/Kdm'. And
          readjust `GdmGreeterTheme.xml' in both location to concide the
          brand information retrived from `trunk/Identity/Images/Brands'
          and the left-bottom buttons xpadding which was changed from 6 to
          10.