namespace-restricted fulltext-search part2

    - now its possible to restrict the fulltext-search to
      multible namespaces

      Examples:

        searchword @ns1 @ns2 @ns3

        "exact phrase" @ns1 @ns2 @ns3

darcs-hash:20060518204647-484ab-061521a81f13360e33496e5163e3cd263a9c1ad6.gz