From Charlie: preserve the whole exception as our cause.

git-svn-id: https://samskivert.googlecode.com/svn/trunk@2609 6335cc39-0255-0410-8fd6-9bcaacd3b74c

src/java/com/samskivert/jdbc/jora/DataTransferError.java

@@ -29,6 +29,6 @@ public class DataTransferError extends java.lang.Error {
         super("Database data transfer error");
     }
     DataTransferError(Exception ex) {
-        super(ex.getMessage());
+        super(ex);
     }
 }