pgsql: When doing a parallel restore, we must guard against out-of-range

Log Message:
-----------
When doing a parallel restore, we must guard against out-of-range dependency
dump IDs, because the array we're using is sized according to the highest
dump ID actually defined in the archive file.  In a partial dump there could
be references to higher dump IDs that weren't dumped.  Treat these the same
as references to in-range IDs that weren't dumped.  (The whole thing is a
bit scary because the missing objects might have been part of dependency
chains, which we won't know about.  Not much we can do though --- throwing
an error is probably overreaction.)

Also, reject parallel restore with pre-1.8 archive version (made by pre-8.0
pg_dump).  In these old versions the dependency entries are OIDs, not dump
IDs, and we don't have enough information to interpret them.

Per bug #5288 from Jon Erdman.

Tags:
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REL8_4_STABLE

Modified Files:
--------------
    pgsql/src/bin/pg_dump:
        pg_backup_archiver.c (r1.172 -> r1.172.2.1)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/bin/pg_dump/pg_backup_archiver.c?r1=1.172&r2=1.172.2.1)