Performance improvement: don't run the device info sync code when adding or deleting a book. The code was already run when the device connected, and nothing critical could change between then and an add/delete.
Merge branch 'master' of https://github.com/cbhaley/calibre
Edit metadata dialog: Add a keyboard shortcut to swap title and author [Alt+Down]. Fixes #1397701 [[Enhancement]](https://bugs.launchpad.net/calibre/+bug/1397701)
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