+ - NOTE BACKWARDS-INCOMPATIBLE CHANGE: The ZOOM::Connection
+ method scan() is renamed scan_pqf(), and a new scan() method
+ is introduced which calls the underlying scan1() function.
+ Thus the scan()/scan_pqf() dichotomy is consistent with that
+ between search()/search_pqf().
+ - The tests t/15-scan.t and t/25-scan.t now also test for
+ scanning by CQL query. To support these tests, a new files
+ is added to the distribution, "samples/cql/pqf.properties"