Use variable aliases, if supplied, rather than real column names in

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

Commit: 8bdc2bf030acae0bdac98c645a3c80f205e7e10a
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2000-09-25T18:14:55Z
Releases: 7.1.1
Use variable aliases, if supplied, rather than real column names in
complaints about ungrouped variables.  This is for consistency with
behavior elsewhere, notably the fact that the relname is reported as
an alias in these same complaints.  Also, it'll work with subselect-
in-FROM where old code didn't.

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