Log Message:
-----------
Fix cost_nestloop and cost_hashjoin to model the behavior of semi and anti
joins a bit better, ie, understand the differing cost functions for matched
and unmatched outer tuples.  There is more that could be done in cost_hashjoin
but this already helps a great deal.  Per discussions with Robert Haas.

Modified Files:
--------------
    pgsql/src/backend/optimizer/path:
        costsize.c (r1.207 -> r1.208)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/path/costsize.c?r1=1.207&r2=1.208)
    pgsql/src/backend/optimizer/plan:
        createplan.c (r1.258 -> r1.259)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/plan/createplan.c?r1=1.258&r2=1.259)
    pgsql/src/backend/optimizer/util:
        restrictinfo.c (r1.58 -> r1.59)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/util/restrictinfo.c?r1=1.58&r2=1.59)
    pgsql/src/include/optimizer:
        restrictinfo.h (r1.43 -> r1.44)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/optimizer/restrictinfo.h?r1=1.43&r2=1.44)

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