anchor.diff:  * MEDIUM: source highlighting using Rouge (instead of Pygments)
   * MEDIUM: to remove text indent in mobi7, set width="0pt" (text-indent) on <p> tag; also set height="1em" (margin top)
   * MEDIUM: create back link in bibliography entry for each reference to it (currently only the first)
  -* packager doesn't resolve include files in subdirectory totally correctly
   * implement checklists
   
   //^
   .Packager
  -* HIGH: retain file name of original chapter file (otherwise, it can break interdoc xrefs)
   * HIGH: add NOTICE.adoc to e-book archive
  -* HIGH: rework GEPUB so closures work more like in Prawn...perhaps using a wrapper
   * HIGH: minimize CSS (and any other assets worth minimizing)
   * HIGH: add back cover if specified
   * MEDIUM: add JavaScript to nav.xhtml to add class for epubReadingSystem to body
   * MEDIUM: rename OEBPS folder to EPUB
  -* MEDIUM: set modified date explicitly
   * MEDIUM: option to add nav.xhtml to navigation flow?
   * MEDIUM: add Pygments stylesheet to EPUB archive if pygments-css=class
   * support subtitle as separate from main title in package metadata
   * support collection title in package metadata
   
   .Fonts
  -* script to merge entypo icons from Font Icons into Font Awesome (name it font-awesomer.ttf)
   * recreate ellipses in M+ 1p to be on baseline
   
   .Stylesheet
  
positive.code: //^
  == REVIEW
  
  * conversion of single file (no master document)
  * package images referenced by content
  * how custom CSS is specified
  
  == NOTES
  
negative.code: * only use the inverted sizes for chapter title if publication-type is not book
  * use overflow-wrap consistently
  * use same logic for chapter title in document header as in TOC (level-1 section title should not be detected)
  * don't add image from front matter if already referenced by chapter
  * add document filename to warn messages (added for some)
  * allow front-matter.xhtml
  * reorder sections in README; needs to flow a bit better...Getting Started is too large & after Structuring your Manuscript
  * support inline SVG
  * describe the leveloffset setting in more detail in the README
  * link to https://medium.com/@sandersk/responsive-ebook-design-a-primer-8bba01328219 in style section in README
  * only uppercase document title if detected in CSS
  * add empty front matter page in kf8 version if one is specified to allow navigation to first entry from TOC
   ** why can't we navigate to first chapter on Kindle from TOC?
  * document more clearly how to provide your own CSS
   ** currently it's not possible to override the epub3-fonts.css (though it should be)
  * cleanup this sanitize XML stuff; move to Asciidoctor::Helpers?
   ** also need an upcase_pcdata
  * allow role to be applied to chapter (which means the role must be on the document)
  