PostgreSQL

# Changes
* Fix WAL replay of locking an already-updated tuple
* Restore GIN metapages unconditionally to avoid torn-page risk
* Avoid race condition in checking transaction commit status during receipt of a NOTIFY message
* Allow materialized views to be referenced in UPDATE and DELETE commands
* Allow regular-expression operators to be terminated early by query cancel requests
* Remove incorrect code that tried to allow OVERLAPS with single-element row arguments
* Avoid getting more than AccessShareLock when de-parsing a rule or view
* Improve performance of index endpoint probes during planning
* Use non-default selectivity estimates for value IN (list) and value operator ANY (array) expressions when the righthand side is a stable expression
* Remove the correct per-database statistics file during DROP DATABASE
* Fix walsender ping logic to avoid inappropriate disconnects under continuous load
* Fix walsender's failure to shut down cleanly when client is pg_receivexlog
* Check WAL level and hot standby parameters correctly when doing crash recovery that will be followed by archive recovery
* Fix test to see if hot standby connections can be allowed immediately after a crash
* Add read-only data_checksums parameter to display whether page checksums are enabled
* Prevent interrupts while reporting non-ERROR messages
* Fix memory leak in PL/Perl when returning a composite result, including multiple-OUT-parameter cases
* Fix tracking of psql script line numbers during /copy from out-of-line data
* Fix contrib/postgres_fdw to handle multiple join conditions properly
* Prevent intermittent "could not reserve shared memory region" failures on recent Windows versions
* Update time zone data files to tzdata release 2014a for DST law changes in Fiji and Turkey, plus historical changes in Israel and Ukraine.