Improve INSERT .. ON CONFLICT error message.

Robert Haas <rhaas@postgresql.org>

Commit: bf8a361e101d830a6db105982a8527325c2e85fc
Author: Robert Haas <rhaas@postgresql.org>
Date: 2015-10-13T19:33:34Z
Releases: 9.5.0
Improve INSERT .. ON CONFLICT error message.

Peter Geoghegan, reviewed by me.

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