Log Message:
calibre: update to 3.26.1.

- version: 3.26.1
  date: 2018-06-15

  new features:
    - title: "Book list: Allow drag and drop of books onto other books to \ 
merge the book records."

    - title: "Check Book: External link checker: Also check HTML anchors \ 
(the part after the # in the link). Can be turned off via a checkbox at the \ 
bottom of the link checker window."

    - title: "Edit Book: Preview panel: Show previews when editing SVG \ 
files"

    - title: "Edit book: When downloading external resources, also convert \ 
data URLs into files."

    - title: "E-book viewer: When the controls are hidden show the progress \ 
in the window title."

    - title: "Library Quick switch menu: Highlight the previously switched \ 
from library in bold."

  bug fixes:
    - title: "PDF Input: Fix a regression in 3.24 that caused conversion of \ 
PDF to be significantly worse."

    - title: "E-book viewer: Fix very slow loading for HTML files with very \ 
many images on Linux."

    - title: "Content server: Fix a regression in 3.14 that removed the \ 
separator between books in the detailed list view mode."

    - title: "Edit book: Fix SVG files not being beautified by the Beautify \ 
all files tool"

    - title: "Edit book: Fix searching in selected files not searching SVG \ 
files"

    - title: "Fix Tweaks help string not being displayed translated"

    - title: "Edit metadata dialog: Fix distorted rendering of some labels \ 
in the custom metadata tab in rare circumstances."

    - title: "version 3.26.1 prevents dropping of a book onto itself from \ 
triggering the merge dialog, which should reduce accidental triggers"

  improved recipes:
    - Slate
    - New York Times Book Review
    - The Independent UK
    - NYTimes Tech Beat
    - New York Times
    - Cracked.com

  new recipes:
    - title: El Cronista
      author: Darko Miletic

- version: 3.25.0
  date: 2018-06-01

  new features:
    - title: "Kobo driver: Support the new Clara HD"

    - title: "PDF Output: Add an option to use page margins from the input \ 
document, specified via @page CSS rules."
      description: "Allows individual HTML files in the input document to \ 
have different page margins in the output PDF."

  bug fixes:
    - title: 'Fix option to "show text under buttons only if there is \ 
enough space" not working well with the option to use "two lines for \ 
the text under the buttons".'

    - title: "Update notification: When both calibre and plugin updates are \ 
available and the user updates only the plugins, fix the restart calibre button \ 
not working."

    - title: "E-book viewer: Fix printing of comics (cbz/cbr files) not \ 
working."

    - title: "EPUB3 Input: Fix Table of Contents not being recognized for \ 
some EPUB 3 books that placed their nav document in-side a sub-folder."

  improved recipes:
    - Associated Press