Fix race condition in transaction log management

There was a narrow window in which an I/O operation could be initiated for the wrong page, leading to an Assert failure or data corruption.

Fix bgwriter problems after recovering from errors (Tom)

The background writer was found to leak buffer pins after write errors. While not fatal in itself, this might lead to mysterious blockages of later VACUUM commands.

Prevent failure if client sends Bind protocol message when current transaction is already aborted

/contrib/ltree fixes (Teodor)

AIX and HPUX compile fixes (Tom)

Retry file reads and writes after Windows NO_SYSTEM_RESOURCES error (Qingqing Zhou)

Fix intermittent failure when log_line_prefix includes %i

Fix psql performance issue with long scripts on Windows (Merlin Moncure)

Fix missing updates of pg_group flat file

Fix longstanding planning error for outer joins

This bug sometimes caused a bogus error “RIGHT JOIN is only supported with merge-joinable join conditions”.

Postpone timezone initialization until after postmaster.pid is created

This avoids confusing startup scripts that expect the pid file to appear quickly.

Prevent core dump in pg_autovacuum when a table has been dropped

Fix problems with whole-row references (foo.*) to subquery results