This is minimal, but I think usable.  In notmuch-show mode % selects a
different duplicate. Since all views (search / tree / unsorted)
ultimately use notmuch-show to display a message, this works
essentially everywhere.

It needs better error handling, and one could imagine a nicer UI
(completion maybe? keys to move to next or previous duplicate?).  It
also needs more tests, but before I invest in that I want to fix the
one screen appearance; the main change here is the n/d indicator at
the right margin. 

The first two patches in the series are generic and could be applied
while we think about UI issues.


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