more visual help with manual duplicate removal

The smart duplicate folder is a great step in the right direction. However it only finds a fraction of the actual duplicates. Short of adopting a smarter algorithm,* perhaps a highlight toggle could be implemented that indicates different (fuzzy) similarities such as "similar author" or "similar title" (ca first 20 characters) to assist manual duplicate removal.

* Papers 2 has the best duplicate finder I've seen (cf. Sente, BibDesk, Qiqqa, Endnote, Bookends, Mendeley)

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