Bug 213126 Add support for DataEngine-leve dataset cache
In many cases the DataEngine-leve dataset cache is useful which ensure that a dataset is executed one time during rendering one report. To support this feature a new dataset property should be added. The Birt customer can choose whether this dataset need to be cached or not by setting the property in deisgn time.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/DataSetHandle.java
removeParamBindingsFor( paramList );
			}
			catch ( PropertyValueException e )
			{
			}
			getModule( ).getActivityStack( ).commit( );
		}
		/**
		 * Removes the parameter binding for the parameters in the given
		 * parameter list. The parameter binding is defined in clients of the
		 * data set in which this handle exists. The instance in the list can be
		 * both <code>DataSetParameterHandle</code> and
		 * <code>DataSetParameter</code>.
		 * 
		 * @param params
		 *            list of the data set parameters
		 * @throws PropertyValueException
		 *             if error occurs when removing parameter binding.
		 */
		private void removeParamBindingsFor( List params )
				throws PropertyValueException
		{
			if ( params == null )
				return;
			Iterator iter = params.iterator( );
			while ( iter.hasNext( ) )
			{
				String paramName = null;
				Object item = iter.next( );
				if ( item instanceof DataSetParameterHandle )