PostgreSQL 9.2.1

# Changes
* Fix persistence marking of shared buffers during WAL replay
* Fix possible incorrect sorting of output from queries involving WHERE indexed_column IN (list_of_values)
* Fix planner failure for queries involving GROUP BY expressions along with window functions and aggregates
* Fix planner's assignment of executor parameters
* Improve planner's handling of join conditions in index scans
* Improve selectivity estimation for text search queries involving prefixes, i.e. word:* patterns
* Fix delayed recognition of permissions changes
* Fix ANALYZE to not fail when a column is a domain over an array type
* Prevent PL/Perl from crashing if a recursive PL/Perl function is redefined while being executed
* Work around possible misoptimization in PL/Perl
* Remove unnecessary dependency on pg_config from pg_upgrade
* Update time zone data files to tzdata release 2012f for DST law changes in Fiji