Update autovacuum to use reloptions instead of a system catalog, for

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

Commit: 834a6da4f72dc8e1bf95e5158033c54369df0cc5
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2009-02-09T20:57:59Z
Releases: 8.4.0
Update autovacuum to use reloptions instead of a system catalog, for
per-table overrides of parameters.

This removes a whole class of problems related to misusing the catalog,
and perhaps more importantly, gives us pg_dump support for the parameters.

Based on a patch by Euler Taveira de Oliveira, heavily reworked by me.

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