pg_dump future problem.

I see an obvious problem in the way pg_dump dumps serials.  At the moment,
we have length 64 identifiers.  If someone has a 64 character table name
and adds a serial to it, it will get a truncated sequence name, with _seq
o the end.

pg_dump will dump it like this:

CREATE TABLE really_long_name (a SERIAL UNIQUE
);

SELECT SETVAL('really_long_na_seq', 120);

However, if we up 7.4, say, to use 128 character identifiers, then this
restore will fail, as the sequence name will NOT be truncated and the
setval() call will fail.

We really need:

ALTER SEQUENCE ON really_long_name(a) ....

Chris