Allow reloption names to have qualifiers, initially supporting a TOAST

Alvaro Herrera <alvherre@alvh.no-ip.org>

Commit: 3a5b77371522b64feda006a7aed2a0e57bfb2b22
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2009-02-02T19:31:40Z
Releases: 8.4.0
Allow reloption names to have qualifiers, initially supporting a TOAST
qualifier, and add support for this in pg_dump.

This allows TOAST tables to have user-defined fillfactor, and will also
enable us to move the autovacuum parameters to reloptions without taking
away the possibility of setting values for TOAST tables.

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