Log Message:
-----------
Adjust cost_nonsequential_access() to have more reasonable behavior
when random_page_cost has a small value.  Per Manfred Koizar, though
I didn't use his equation exactly.

Modified Files:
--------------
    pgsql-server/src/backend/optimizer/path:
        costsize.c (r1.130 -> r1.131)
        
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/optimizer/path/costsize.c.diff?r1=1.130&r2=1.131)

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