Log Message:
-----------
add suuport for pg_stat_statements
Modified Files:
--------------
pgstatspack/sql:
pgstatspack_delete_old_stats.sql (r1.2 -> r1.3)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatspack/pgstatspack/sql/pgstatspack_delete_old_stats.sql?r1=1.2&r2=1.3)