Re: Assorted improvements in pg_dump

Here's an updated version of this patch set. The only non-line-number
changes are

(1) in 0004, I dealt with the issue of not having unnest() in old branches
by bumping the minimum remote server version to 8.4. Seeing that we seem
to have consensus in the other thread to push the minimum up to somewhere
around 9.2, I see no point in making this patch put in conditional code
that we'd shortly rip out again.

(2) I also added some comments to 0004 to hopefully address Justin's
confusion about string lengths.

I feel quite fortunate that a month's worth of commitfest hacking
didn't break any of these patches. Unless someone intends to
review these more thoroughly than they already have, I'd like to
go ahead and push them.

regards, tom lane