Change expandRTE() and ResolveNew() back to taking just the single

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

Commit: e18e8f873594fd4ff2f12e734a624102d3ef1e39
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2005-06-04T19:19:42Z
Releases: 8.1.0
Change expandRTE() and ResolveNew() back to taking just the single
RTE of interest, rather than the whole rangetable list.  This makes
the API more understandable and avoids duplicate RTE lookups.  This
patch reverts no-longer-needed portions of my patch of 2004-08-19.

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