Fix keyboard focus not going to cover grid after doing a search. Fixes #1369160 [post entering a search focus is on an element of the search result in default mode but on the search box in cover grid mode](https://bugs.launchpad.net/calibre/+bug/1369160)
Fix the row numbers in the book list remaining wide when switching libraries if some books were marked before the switch. Fixes #1369152 [Column width behaviour](https://bugs.launchpad.net/calibre/+bug/1369152)
Ensure there is never a double space after the title when creating file/folder names in the calibre library
Use a dictionary for color themes so we can add extra fields easily later
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More color schemes for generated covers
Make ensure_app() thread-safe
Add a comment to generated cover's metadata so they can be easily identified
Use new cover generation for bulk metadata edit
Edit Book: Handle books that contain links that are absolute filenames on windows (i.e. those that start with a drive letter)
Use the new cover generation code to generate default covers during conversion
Prevent generate cover from failing if the user disables all styles or color themes.
Use the new generated covers for recipes that do not specify their own cover
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