Changes 8.1.13:

* Make pg_get_ruledef() parenthesize negative constants (Tom)
  Before this fix, a negative constant in a view or rule might be
  dumped as, say, -42::integer, which is subtly incorrect: it should
  be (-42)::integer due to operator precedence rules. Usually this
  would make little difference, but it could interact with another
  recent patch to cause PostgreSQL to reject what had been a valid
  "SELECT DISTINCT" view query. Since this could result in pg_dump
  output failing to reload, it is being treated as a high-priority
  fix. The only released versions in which dump output is actually
  incorrect are 8.3.1 and 8.2.7.
* Make "ALTER AGGREGATE ... OWNER TO" update pg_shdepend (Tom)
  This oversight could lead to problems if the aggregate was later
  involved in a "DROP OWNED" or "REASSIGN OWNED" operation.

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