Mention the index name in 'could not create unique index' errors,

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 2aae35d049274b6364aa01add629c33a1e2e6089
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2007-10-29T21:31:28Z
Releases: 8.3.0
Mention the index name in 'could not create unique index' errors,
per suggestion from Rene Gollent.

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