NEW:
- removing duplicates in authors, series, publishers and TOC is now more robust;
  an option to also accept "The title" being equal to "title, The" was added.
- #169: dd support for high resolution covers from DNB (Enable in the site settings to use)
- Added support for the new Calibre "pages" and "#read_progress" fields.
- The Websites settings list now provides direct access to individual
  site settings using a row menu button.