Whack some sense into the configuration-file-location patch.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 7ca3a0f3e28e9d89d390214f6be59d7c8e88d367
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2004-10-08T01:36:36Z
Releases: 8.0.0
Whack some sense into the configuration-file-location patch.
Refactor code into something reasonably understandable, cause
use of the feature to not fail in standalone backends or in
EXEC_BACKEND case, fix sloppy guc.c table entries, make the
documentation minimally usable.

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