Patch to put rudimentary dependency support into pg_dump. This addresses

the UDT/function order problem.

    - Rudimentary support for dependencies in archives.
      Uses dependencies to modify the OID used in sorting TOC
      entries. This will NOT handle multi-level dependencies,
      but will manage simple relationships like UDTs & their functions.

    - Treat OIDs with more respect (avoid using ints, use macros
      for conversion & comparison).