Remove pg_dump/pg_dumpall support for dumping from pre-8.0 servers.

The need for dumping from such ancient servers has decreased to about nil
in the field, so let's remove all the code that catered to it.  Aside
from removing a lot of boilerplate variant queries, this allows us to not
have to cope with servers that don't have (a) schemas or (b) pg_depend.
That means we can get rid of assorted squishy code around that.  There
may be some nonobvious additional simplifications possible, but this patch
already removes about 1500 lines of code.

I did not remove the ability for pg_restore to read custom-format archives
generated by these old versions (and light testing says that that does
still work).  If you have an old server, you probably also have a pg_dump
that will work with it; but you have an old custom-format backup file,
that might be all you have.

It'd be possible at this point to remove fmtQualifiedId()'s version
argument, but I refrained since that would affect code outside pg_dump.

Discussion: <>



Modified Files
doc/src/sgml/ref/pg_dump.sgml        |    7 +-
src/bin/pg_dump/dumputils.c          |   50 +-
src/bin/pg_dump/pg_backup_archiver.c |    2 +-
src/bin/pg_dump/pg_dump.c            | 1761 ++++------------------------------
src/bin/pg_dump/pg_dump.h            |    1 -
src/bin/pg_dump/pg_dump_sort.c       |   96 +-
src/bin/pg_dump/pg_dumpall.c         |  110 +--
7 files changed, 250 insertions(+), 1777 deletions(-)

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