Make MOVE/FETCH 0 actually move/fetch 0. Add MOVE LAST to move to end

Bruce Momjian <bruce@momjian.us>

Commit: 4e5a947d1c0db0d826ec422c2aa899915c6f1758
Author: Bruce Momjian <bruce@momjian.us>
Date: 2002-11-13T00:44:09Z
Releases: 7.4.1
Make MOVE/FETCH 0 actually move/fetch 0.  Add MOVE LAST to move to end
of cursor.

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