Reduce scope of changes for COPY FREEZE.

Simon Riggs <simon@2ndQuadrant.com>

Commit: 5457a130d3a66db807d1e0ee2b8e829321809b83
Author: Simon Riggs <simon@2ndQuadrant.com>
Date: 2012-12-02T20:52:52Z
Releases: 9.3.0
Reduce scope of changes for COPY FREEZE.
Allow support only for freezing tuples by explicit
command. Previous coding mistakenly extended
slightly beyond what was agreed as correct on -hackers.
So essentially a partial revoke of earlier work,
leaving just the COPY FREEZE command.

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