Support explicit placement of the temporary-table schema within search_path, and disable searching it for functions and operators (Tom)

This is needed to allow a security-definer function to set a truly secure value of search_path. Without it, an unprivileged SQL user can use temporary objects to execute code with the privileges of the security-definer function (CVE-2007-2138). See CREATE FUNCTION for more information.

/contrib/tsearch2 crash fixes (Teodor)

Require COMMIT PREPARED to be executed in the same database as the transaction was prepared in (Heikki)

Fix potential-data-corruption bug in how VACUUM FULL handles UPDATE chains (Tom, Pavan Deolasee)

Planner fixes, including improving outer join and bitmap scan selection logic (Tom)

Fix PANIC during enlargement of a hash index (bug introduced in 8.1.6) (Tom)

Fix POSIX-style timezone specs to follow new USA DST rules (Tom)