anchor.diff:  
   * add a test suite
   * refactor as Prawn View
  -* add support for AsciiDoc table cell content by writing custom Table::Cell implementation
  +* add support for footnotes (as article or chapter endnotes)
   * add support for nested tables by writing custom Table::Cell implementation
  -* add support for footnotes (as article or chapter endnotes)
  +* pass styles downwards to child elements in formatted text transform instead of decorating on way out of hierarchy
   * rework text handling in Prawn to support line height natively
   * margin collapsing (like CSS)
   
  
positive.code: * FILE ISSUE: when split source listing, add top padding to bounding box (or is it the line metrics top?)
    - perhaps this has to do with the a miscalculation in dry run when not starting from same y position?
    - separate theme control for listing vs literal block (and maybe source too)
  * should we print alt text if an error is caught when attempting to embed an image?
  * stroke and fill multi-page sidebar block (#259) and example block (#362)
  * support URL images in running content (need to delegate to resolve_image_path)
  * rewrite optimize-pdf using rghost (#535) (also see #21 and #22)
    - add Optimizer class; wire to cli (separate issue?)
    - we could recommend using HexaPDF with some sample code in README, but we can't integrate it since it's AGPL
  * add feature to number bullets according to section number (needed for OpenDevise agreements)
  * outline should link to title page if there's a cover page (skip cover page and ensuing blank page)
  * don't allow title page content to jump to next page
  
negative.code: * allow character spacing to be controlled by theme
  * might be able to avoid dry run for listing/literal in obvious cases; engineering estimate
  * allow pdf-page-margin to be set in document
    - intended primarily for image slideshows
    - this is slighly more complicated now that we have mirror margins; perhaps can't set those from document?
  * use `module Asciidoctor; module PDF; module FormattedText` convention to simplify indentation
  * introduce code style guide (like in Jekyll AsciiDoc); perhaps make this a shared file in the Asciidoctor ecosystem?
  