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.