anchor.diff:  
   == TODO
   
  +* upgrade Treetop
   * rename example to basic-example and chronicles to chronicles-example
   * recognize inline image syntax in page_background_image key
   * allow front cover and back cover image to be defined in theme; document in theming-guide
  
positive.code: * separate theme control for listing vs literal block (and maybe source too)
  * allow title page image "bottom" to be set instead of "top" (mutually exclusive)
  
  * pass macro doesn't work in source block when macro subs and highlighting are both enabled
  * bind image_registry between scratch and main document so we don't process the same image more than once
    - need to do some testing
  
negative.code: 
  * uncompress PNG files
  * avoid the fallback font if possible (use full fonts in your theme)
  * font families used in SVGs must match keys in the font catalog
  
  == Open Questions
  
  