next: reword error output
We move to a more compact and direct phrasing. I'm not fully happy about it yet,
but this is a step forward. The listing of candidate should maybe be moved
behind a --verbose flag (and such verbose flag be suggested in the error).
G: changed tests/test-prev-next.t
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Copyright 2011 Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
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Pierre-Yves David <pierre-yves.david@ens-lyon.org>
Patrick Mezard <patrick@mezard.eu>
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