Log Message:
-----------
add new function for retrieving unused indexes
Added Files:
-----------
pgstatspack/sql:
pgstatspack_get_unused_indexes.sql (r1.1)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/pgstatspack/pgstatspack/sql/pgstatspack_get_unused_indexes.sql?rev=1.1&content-type=text/x-cvsweb-markup)