Fix for dumoing WITH/WITHOUT oids

The attached patch prevents WITH/WITHOUT OIDS from appearing in pg_dump
output. Instead, it uses "SET default_with_oids" to control oid
creation, but only outputs it when the table characteristics change, not
for every table.

The patch basically add a withOids field to the table of contents
(TocEntry). TocEntries are part of our binary dumps. I updated the
pg_dump version number. The code conditinally reads the TocEntry and
reads this field if the version is as new as the new 1.9 version.

The patch adds a new ArchiveHandle.currWithOids to track the current
backend default_with_oids setting. This boolean variable is set to -1
on new connection so it will trigger a SET when first used.

The majority of the patch is adding withOids to all the ArchiveEntry
calls, even though it is only used for the TABLE tag.

I have tested this patch in both binary and ASCII outputs. Binary gets
the OID setting from the TocEntry, while ASCII keeps track of the OID
setting.

--
Bruce Momjian | http://candle.pha.pa.us
pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 359-1001
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