pgsql: Rename contrib contains/contained-by operators to @> and <@, per

Log Message:
-----------
Rename contrib contains/contained-by operators to @> and <@, per discussion.

Modified Files:
--------------
    pgsql/contrib/cube:
        README.cube (r1.8 -> r1.9)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/cube/README.cube.diff?r1=1.8&r2=1.9)
        cube.c (r1.28 -> r1.29)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/cube/cube.c.diff?r1=1.28&r2=1.29)
        cube.sql.in (r1.18 -> r1.19)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/cube/cube.sql.in.diff?r1=1.18&r2=1.19)
        uninstall_cube.sql (r1.3 -> r1.4)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/cube/uninstall_cube.sql.diff?r1=1.3&r2=1.4)
    pgsql/contrib/cube/expected:
        cube.out (r1.19 -> r1.20)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/cube/expected/cube.out.diff?r1=1.19&r2=1.20)
        cube_1.out (r1.7 -> r1.8)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/cube/expected/cube_1.out.diff?r1=1.7&r2=1.8)
        cube_2.out (r1.4 -> r1.5)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/cube/expected/cube_2.out.diff?r1=1.4&r2=1.5)
    pgsql/contrib/cube/sql:
        cube.sql (r1.10 -> r1.11)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/cube/sql/cube.sql.diff?r1=1.10&r2=1.11)
    pgsql/contrib/earthdistance:
        README.earthdistance (r1.6 -> r1.7)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/earthdistance/README.earthdistance.diff?r1=1.6&r2=1.7)
    pgsql/contrib/earthdistance/expected:
        earthdistance.out (r1.10 -> r1.11)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/earthdistance/expected/earthdistance.out.diff?r1=1.10&r2=1.11)
    pgsql/contrib/earthdistance/sql:
        earthdistance.sql (r1.8 -> r1.9)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/earthdistance/sql/earthdistance.sql.diff?r1=1.8&r2=1.9)
    pgsql/contrib/hstore:
        README.hstore (r1.2 -> r1.3)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/hstore/README.hstore.diff?r1=1.2&r2=1.3)
        hstore.sql.in (r1.1 -> r1.2)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/hstore/hstore.sql.in.diff?r1=1.1&r2=1.2)
    pgsql/contrib/hstore/expected:
        hstore.out (r1.1 -> r1.2)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/hstore/expected/hstore.out.diff?r1=1.1&r2=1.2)
    pgsql/contrib/hstore/sql:
        hstore.sql (r1.1 -> r1.2)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/hstore/sql/hstore.sql.diff?r1=1.1&r2=1.2)
    pgsql/contrib/intarray:
        README.intarray (r1.12 -> r1.13)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/intarray/README.intarray.diff?r1=1.12&r2=1.13)
        _int.sql.in (r1.21 -> r1.22)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/intarray/_int.sql.in.diff?r1=1.21&r2=1.22)
        _int_gin.c (r1.1 -> r1.2)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/intarray/_int_gin.c.diff?r1=1.1&r2=1.2)
        _int_gist.c (r1.14 -> r1.15)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/intarray/_int_gist.c.diff?r1=1.14&r2=1.15)
        _intbig_gist.c (r1.11 -> r1.12)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/intarray/_intbig_gist.c.diff?r1=1.11&r2=1.12)
        uninstall__int.sql (r1.3 -> r1.4)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/intarray/uninstall__int.sql.diff?r1=1.3&r2=1.4)
    pgsql/contrib/intarray/expected:
        _int.out (r1.17 -> r1.18)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/intarray/expected/_int.out.diff?r1=1.17&r2=1.18)
    pgsql/contrib/intarray/sql:
        _int.sql (r1.9 -> r1.10)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/intarray/sql/_int.sql.diff?r1=1.9&r2=1.10)
    pgsql/contrib/seg:
        README.seg (r1.5 -> r1.6)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/seg/README.seg.diff?r1=1.5&r2=1.6)
        seg.c (r1.18 -> r1.19)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/seg/seg.c.diff?r1=1.18&r2=1.19)
        seg.sql.in (r1.12 -> r1.13)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/seg/seg.sql.in.diff?r1=1.12&r2=1.13)
        uninstall_seg.sql (r1.2 -> r1.3)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/seg/uninstall_seg.sql.diff?r1=1.2&r2=1.3)
    pgsql/contrib/seg/expected:
        seg.out (r1.11 -> r1.12)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/seg/expected/seg.out.diff?r1=1.11&r2=1.12)
        seg_1.out (r1.2 -> r1.3)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/seg/expected/seg_1.out.diff?r1=1.2&r2=1.3)
    pgsql/contrib/seg/sql:
        seg.sql (r1.3 -> r1.4)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/seg/sql/seg.sql.diff?r1=1.3&r2=1.4)
    pgsql/contrib/tsearch2/expected:
        tsearch2.out (r1.23 -> r1.24)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/tsearch2/expected/tsearch2.out.diff?r1=1.23&r2=1.24)
    pgsql/contrib/tsearch2:
        query_gist.c (r1.8 -> r1.9)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/tsearch2/query_gist.c.diff?r1=1.8&r2=1.9)
        tsearch.sql.in (r1.19 -> r1.20)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/tsearch2/tsearch.sql.in.diff?r1=1.19&r2=1.20)
        untsearch.sql.in (r1.7 -> r1.8)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/tsearch2/untsearch.sql.in.diff?r1=1.7&r2=1.8)
    pgsql/contrib/tsearch2/sql:
        tsearch2.sql (r1.12 -> r1.13)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/tsearch2/sql/tsearch2.sql.diff?r1=1.12&r2=1.13)
    pgsql/doc/src/sgml/ref:
        create_opclass.sgml (r1.14 -> r1.15)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/create_opclass.sgml.diff?r1=1.14&r2=1.15)