Replace generic 'Illegal use of aggregates' error message with one that

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

Commit: f7f41c7c8c34edec610240405569ed6e0954e03e
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 1999-12-09T05:58:56Z
Releases: 7.1.1
Replace generic 'Illegal use of aggregates' error message with one that
shows the specific ungrouped variable being complained of.  Perhaps this
will reduce user confusion...

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