First bits of work on error message editing.

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

Commit: 216311d590de4638997eb391722f915026a29e88
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2003-07-18T23:20:33Z
Releases: 7.4.1
First bits of work on error message editing.

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