Update Spektrum der Wissenschaft
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Decrease size of icns files in the OS X app bundle

By running the PNG images through a PNG optimizer. Also specify a
thumbnail image to use for files associated with calibre. Fixes #295 (Icon association for book files on Mac)
Edit Book: Fix the Check Book tool leaking threads
Explicitly close ThreadPool from multiprocessing to ensure no leaked threads
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Update LA Times
E-book viewer: Automatically hide the mouse cursor if the mouse has not been used for a few seconds. This prevents the mouse cursor from obscuring text underneath it. The cursor will reappear automatically when you move the mouse.
Table of Contents editor: When the user tries to use the buttons for moving a single item to move multiple items, popup a help message telling them to use drag and drop instead.
Merge commit '837a83ec19dae51bd5f14ba843f2325621494fbd' into apnxfiles

* commit '837a83ec19dae51bd5f14ba843f2325621494fbd':
  Table of Contents editor: When the user tries to use the buttons for moving a single item to move multiple items, popup a help message telling them to use drag and drop instead.
  E-book viewer: Automatically hide the mouse cursor if the mouse has not been used for a few seconds. This prevents the mouse cursor from obscuring text underneath it. The cursor will reappear automatically when you move the mouse.
  Update LA Times
  ...
  Explicitly close ThreadPool from multiprocessing to ensure no leaked threads
  Edit Book: Fix the Check Book tool leaking threads
  Decrease size of icns files in the OS X app bundle
  ...
  Update Spektrum der Wissenschaft