Fix xmlconcat by properly merging the XML declarations. Add aggregate

Peter Eisentraut <peter_e@gmx.net>

Commit: b4c8d49036b971d892b2dfe1c71d3f0cee116e7f
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2007-01-20T09:27:20Z
Releases: 8.3.0
Fix xmlconcat by properly merging the XML declarations.  Add aggregate
function xmlagg.

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