bg worker: patch 4 of 6 - renaming

Markus Wanner <markus@bluegap.ch>

From: Markus Wanner <markus@bluegap.ch>
To: PostgreSQL-development Hackers <pgsql-hackers@postgresql.org>
Date: 2010-07-13T14:31:22Z
Lists: pgsql-hackers

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Lots of variable renaming and comment adjustment, mostly to achieve a 
consistent naming. The former launcher gets renamed to coordinator and 
the avworkers to background (bg)workers. No functional change (hopefully).

The GUC autovacuum_max_workers got renamed to max_background_workers.