pgstatspack - pgstatspack: add support for 8.1

Log Message:
-----------
add support for 8.1

Modified Files:
--------------
    pgstatspack:
        install_pgstats.sh (r1.4 -> r1.5)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatspack/pgstatspack/install_pgstats.sh?r1=1.4&r2=1.5)
        remove_pgstats.sh (r1.3 -> r1.4)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatspack/pgstatspack/remove_pgstats.sh?r1=1.3&r2=1.4)
        upgrade_pgstatspack.sh (r1.6 -> r1.7)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatspack/pgstatspack/upgrade_pgstatspack.sh?r1=1.6&r2=1.7)
    pgstatspack/bin:
        delete_snapshot.sh (r1.1 -> r1.2)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatspack/pgstatspack/bin/delete_snapshot.sh?r1=1.1&r2=1.2)
        pgstatspack_report.sh (r1.5 -> r1.6)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatspack/pgstatspack/bin/pgstatspack_report.sh?r1=1.5&r2=1.6)
        snapshot.sh (r1.2 -> r1.3)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatspack/pgstatspack/bin/snapshot.sh?r1=1.2&r2=1.3)
    pgstatspack/sql:
        pgstats_exist.sql (r1.2 -> r1.3)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatspack/pgstatspack/sql/pgstats_exist.sql?r1=1.2&r2=1.3)
        pgstatspack_remove_tables.sql (r1.3 -> r1.4)

(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatspack/pgstatspack/sql/pgstatspack_remove_tables.sql?r1=1.3&r2=1.4)