pgsql: Fix pg_restore to complain if any arguments remain after parsing

Log Message:
-----------
Fix pg_restore to complain if any arguments remain after parsing the switches
and input file name, per bug #5617 from Leo Shklovskii. Rearrange the
corresponding code in pg_dump and pg_dumpall so that all three programs
handle this in a consistent, straightforward fashion.

Back-patch to 9.0, but no further. Although this is certainly a bug, it's
possible that people have scripts that will be broken by the added error
check, so it seems better not to change the behavior in stable branches.

Tags:
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REL9_0_STABLE

Modified Files:
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pgsql/src/bin/pg_dump:
pg_dump.c (r1.581.2.1 -> r1.581.2.2)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/bin/pg_dump/pg_dump.c?r1=1.581.2.1&r2=1.581.2.2)
pg_dumpall.c (r1.134 -> r1.134.4.1)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/bin/pg_dump/pg_dumpall.c?r1=1.134&r2=1.134.4.1)
pg_restore.c (r1.102 -> r1.102.2.1)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/bin/pg_dump/pg_restore.c?r1=1.102&r2=1.102.2.1)