Clarify some error messages about duplicate things.

Peter Eisentraut <peter_e@gmx.net>

Commit: f4a3789b39e91635ad9eec6d46be305d3302219e
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2007-06-03T22:16:03Z
Releases: 8.3.0
Clarify some error messages about duplicate things.

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