Modifications to clone() on insertion and extraction from cache, from Zell. A

whole bunch of type safety jockeying and concretification of QueryClause by
yours truly.


git-svn-id: https://samskivert.googlecode.com/svn/trunk@2035 6335cc39-0255-0410-8fd6-9bcaacd3b74c

src/java/com/samskivert/jdbc/depot/DepotMarshaller.java

@@ -63,7 +63,7 @@ import static com.samskivert.jdbc.depot.Log.log;
  * Handles the marshalling and unmarshalling of persistent instances to JDBC primitives ({@link
  * PreparedStatement} and {@link ResultSet}).
  */
-public class DepotMarshaller<T>
+public class DepotMarshaller<T extends PersistentRecord>
 {
     /** The name of a private static field that must be defined for all persistent object classes.
      * It is used to handle schema migration. If automatic schema migration is not desired, define