Edit book: Allow editing of .plist files as XML
Fix #1266079 [eBook Reader "ImCoSys imcoV6L" not detected by calibre](https://bugs.launchpad.net/calibre/+bug/1266079)
Edit book: Prevent arrange into folders tool from moving files inside the META-INF folder
Refactor the workaround for QPlainTextEdit's mangling of nbsp into a separate class
Add in a default implementation of the event() override
Start work on diff view
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Syntax highlighting for the diff view
Fix first line being lost in diff view
Add line numbers to the diff view
Update New York Review of Books
Update Business Week Magazine
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Implement drawing colored backgrounds for change blocks
Mark boundaries between context groups
Fix #1270552 [Spelling mistake](https://bugs.launchpad.net/calibre/+bug/1270552)
Update Daily Express
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Fix #1270533 [Rename Orizon plugin to Cybook Orizon](https://bugs.launchpad.net/calibre/+bug/1270533)
Ensure that neighboring changes of the same kind are merged