pg_dump patch from Philip Warner

doc/TODO.detail/function

src/bin/pg_dump/Makefile

src/bin/pg_dump/README

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_custom.c

src/bin/pg_dump/pg_backup_files.c

src/bin/pg_dump/pg_backup_plain_text.c

src/bin/pg_dump/pg_dump.c

src/bin/pg_dump/pg_dump.h

src/bin/pg_dump/pg_dumpall.sh

src/bin/pg_dump/pg_restore.c