Log Message:
calibre: update to 3.22.1.

- version: 3.22.1
  date: 2018-04-19

  new features:
    - title: "Edit book: Add a tool to upgrade books from EPUB 2 to EPUB 3 \ 
(Tools->Upgrade book internals)"
      description: "Automatically upgrades metadata, converts the NCX table \ 
of contents and adds required manifest annotations"
      type: major

    - title: "Add support for the FBZ format (zipped FB2)"

    - title: "Kindle driver: Change the height of generated thumbnails to \ 
500px, needed for the Oasis 2017"

    - title: "Edit book: When bulk renaming files add an option to rename \ 
by the order in which the files appear in the book."

    - title: "Polishing: Recognize titlepages that are marked as covers in \ 
the EPUB 3 landmarks section"

    - title: "Edit Book: Automatically updated the modified timestamp in \ 
the OPF when saving EPUB 3 books."

    - title: "Remove the ISBNDB metadata plugin as ISBNDB no longer allows \ 
free lookups."

  bug fixes:
    - title: "EPUB 3 metadata: If the book defines more than one author \ 
sort value for an author use the first instead of the last"

    - title: "Check Book: Dont warn for nav document not in spine in EPUB 3 \ 
books"

    - title: "Linux installer: Fix umask question not working with the \ 
recommended install command because stdin is a pipe"

    - title: "Browser viewer: Show an error message when trying to use the \ 
Sync function without being logged in"

    - title: "When setting cover from a PDF file and the user clicks \ 
cancel, do not delete the existing cover"