Bug 121498 When datasource/dataset deleted, the datasource/dataset property binding element haven't been deleted
When deleted the datasource/dataset, the datasource/dataset property binding element haven't been deleted. Expected result: This operation must be a transaction.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/core/Module.java
{
		ContainerSlot slot = target.getSlot( slotId );
		Iterator iter = slot.iterator( );
		while ( iter.hasNext( ) )
		{
			DesignElement element = (DesignElement) iter.next( );
			assert element instanceof ReferenceableElement;
			ReferenceableElement referenceableElement = (ReferenceableElement) element;
			
			updateClientReferences( referenceableElement );
			
			if ( referenceableElement instanceof Theme )
				updateReferenceableClients( referenceableElement,
						Theme.STYLES_SLOT );
		}
	}
	/**
	 * Updates the element reference which refers to the given referenceable
	 * element.
	 * 
	 * @param referred
	 *            the element whose element references are updated
	 */
	public void updateClientReferences( ReferenceableElement referred )
	{
		List clients = referred.getClientList( );
		Iterator iter = clients.iterator( );
		while ( iter.hasNext( ) )
		{
			BackRef ref = (BackRef) iter.next( );