First pass at schema-fying pg_dump/pg_restore. Much to do still,

doc/src/sgml/ref/pg_dump.sgml

doc/src/sgml/ref/pg_restore.sgml

src/bin/pg_dump/common.c

src/bin/pg_dump/pg_backup.h

src/bin/pg_dump/pg_backup_archiver.c

src/bin/pg_dump/pg_backup_archiver.h

src/bin/pg_dump/pg_backup_db.c

src/bin/pg_dump/pg_backup_db.h

src/bin/pg_dump/pg_backup_null.c

src/bin/pg_dump/pg_backup_tar.c

src/bin/pg_dump/pg_dump.c

src/bin/pg_dump/pg_dump.h

src/bin/pg_dump/pg_restore.c