Remove psql support for server versions preceding 9.2.

Clean up some more freshly-dead code in pg_dump and pg_upgrade.

Remove pg_dump's --no-synchronized-snapshots switch.

Remove pg_upgrade support for upgrading from pre-9.2 servers.

Remove pg_dump/pg_dumpall support for dumping from pre-9.2 servers.

In pg_dump, use simplehash.h to look up dumpable objects by OID.

Fix frontend version of sh_error() in simplehash.h.

pg_dump: avoid unsafe function calls in getPolicies().

Postpone calls of unsafe server-side functions in pg_dump.

Rethink pg_dump's handling of object ACLs.

Refactor pg_dump's tracking of object components to be dumped.