Log message:
Changes 8.4.8:
* fix build issues on HP-UX and Itanium
* update time zone files for recent time zone changes
* change SQLSTATE for Hot Standby warnings
* prevent bgwriter hang during recovery
* prevent recursive composite type creation
* disallow dropping tables whose triggers are still pending
* allow use of "replication" as a user name
* prevent a crash during GEQO planning
* improve join plans for tables with missing statistics
* fix error with SELECT FOR UPDATE in a subselect
* close PL/python array slice memory leak
* allow SSL connections for users with no home directory

Log message:
Changes 8.4.7:
* Avoid failures when "EXPLAIN" tries to display a simple-form CASE
  expression.
* Fix assignment to an array slice that is before the existing range
  of subscripts.
* Avoid unexpected conversion overflow in planner for very distant
  date values.
* Fix pg_restore's text output for large objects (BLOBs) when
  standard_conforming_strings is on.
* Fix erroneous parsing of tsquery values containing ... &
  !(subexpression) | ...
* Fix buffer overrun in "contrib/intarray"'s input function for the
  query_int type.
* Fix bug in "contrib/seg"'s GiST picksplit algorithm.

Log message:
Changes 8.4.6:
* Force the default wal_sync_method to be fdatasync on Linux
* Fix assorted bugs in WAL replay logic for GIN indexes
* Fix recovery from base backup when the starting checkpoint WAL
  record is not in the same WAL segment as its redo point
* Fix persistent slowdown of autovacuum workers when multiple workers
  remain active for a long time
* Add support for detecting register-stack overrun on IA64
* Add a check for stack overflow in copyObject()
* Fix detection of page splits in temporary GiST indexes
* Fix error checking during early connection processing
* Improve efficiency of window functions
* Avoid memory leakage while "ANALYZE"'ing complex index expressions
* Ensure an index that uses a whole-row Var still depends on its table
* Do not "inline" a SQL function with multiple OUT parameters
* Behave correctly if ORDER BY, LIMIT, FOR UPDATE, or WITH is
  attached to the VALUES part of INSERT ... VALUES
* Fix constant-folding of COALESCE() expressions
* Fix postmaster crash when connection acceptance (accept() or one of
  the calls made immediately after it) fails, and the postmaster was
  compiled with GSSAPI support
* Fix missed unlink of temporary files when log_temp_files is active
* Add print functionality for InhRelation nodes
* Fix incorrect calculation of distance from a point to a horizontal
  line segment
* Fix incorrect calculation of transaction status in ecpg
* Fix PL/pgSQL's handling of "simple" expressions to not fail in
  recursion or error-recovery cases
* Fix PL/Python's handling of set-returning functions
* Fix bug in "contrib/cube"'s GiST picksplit algorithm
* Don't emit "identifier will be truncated" notices in
  "contrib/dblink" except when creating new connections
* Fix potential coredump on missing public key in "contrib/pgcrypto"
* Fix memory leak in "contrib/xml2"'s XPath query functions
* Update time zone data files to tzdata release 2010o for DST law
  changes in Fiji and Samoa; also historical corrections for Hong
  Kong.

Log message:
databases/postgresql84-dblink is a contributed module for PostgreSQL to
allow for connection to a remote server directly from a DB backend, e.g.
from PL/pgSQL functions.