PostgreSQL 9.1.1

* Make pg_options_to_table return NULL for an option with no value , Previously such cases would result in a server crash.
* Fix memory leak at end of a GiST index scan , Commands that perform many separate GiST index scans, such as verification of a new GiST-based exclusion constraint on a table already containing many rows, could transiently require large amounts of memory due to this leak.
* Fix explicit reference to pg_temp schema in CREATE TEMPORARY TABLE , This used to be allowed, but failed in 9.1.0.