Implement md5(bytea), update regression tests and documentation. Patch

Neil Conway <neilc@samurai.com>

Commit: f3567eeaf2423c933166edff320ab1a7093f1ac4
Author: Neil Conway <neilc@samurai.com>
Date: 2005-05-20T01:29:56Z
Releases: 8.1.0
Implement md5(bytea), update regression tests and documentation. Patch
from Abhijit Menon-Sen, minor editorialization from Neil Conway. Also,
improve md5(text) to allocate a constant-sized buffer on the stack
rather than via palloc.

Catalog version bumped.

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