4.3 branch
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- Possibly provide different size of PNG icons for the filesystem, 
  devices and stock categories
- Draw the 2 or 3 missing mimetypes icons like the "unknown" and 
  "x-genesis-rom" (?) ones
- Think about filename.icon files
  http://standards.freedesktop.org/icon-theme-spec/icon-theme-spec-latest.html#file_formats
