Use \ as pathsep in manual. Fixes #1382704 [Location of files on Windows system](https://bugs.launchpad.net/calibre/+bug/1382704)
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Fix regression in previous release that prevented arrow keys/tab key from working in completion popups on OSX. Fixes #1382633 [Unable to use arrow buttons](https://bugs.launchpad.net/calibre/+bug/1382633)
Nicer event debugging
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