pg_dump and serial

This patch was already applied by Tom. I incorrectly added it to the
patches queue.

---------------------------------------------------------------------------

Rod Taylor wrote:

- Drop UNIQUE portion of SERIAL as per -hackers conversation
- Brief note about SERIAL dependencies not working in DBs from 7.2 and
prior
- Dump SERIAL via pg_dump
- Add a pg_column_is_serial function to make the job of interfaces
easier.

Sample dump output attached. Sequence stuff is normal, rest are
serials.

[ Attachment, skipping... ]

[ Attachment, skipping... ]

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