pgsql: Correct calculations of overlap and contains operations over

Log Message:
-----------
Correct calculations of overlap and contains operations over polygons.

Modified Files:
--------------
    pgsql/src/backend/utils/adt:
        geo_ops.c (r1.102 -> r1.103)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/geo_ops.c?r1=1.102&r2=1.103)
    pgsql/src/test/regress/expected:
        create_index.out (r1.30 -> r1.31)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/create_index.out?r1=1.30&r2=1.31)
        polygon.out (r1.14 -> r1.15)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/polygon.out?r1=1.14&r2=1.15)
    pgsql/src/test/regress/sql:
        create_index.sql (r1.26 -> r1.27)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/sql/create_index.sql?r1=1.26&r2=1.27)
        polygon.sql (r1.9 -> r1.10)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/sql/polygon.sql?r1=1.9&r2=1.10)