Update postgresql with latest patch release.
A critical fix repairs an error in ReadBuffer that can cause data loss
due to overwriting recently-added pages. This applies to the 8.1 and
8.0 branches on all platforms.
Note that this update might require a reindex of textual columns under
certain conditions; please see UPDATING.
Other fixes included are:
-- Character string locale comparison bug. This may require a REINDEX
on text column indexes in some locales, such as Hungarian.
-- Prevent accidental changes of locale by plperl
-- Two fixes for Japanese encodings
-- Two fixes for COPY CSV
-- Fixes for functions returning RECORD
-- Fixes to autovacuum, dblink and pgcrypto