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
* The set of slots for the module.
	 */
	protected ContainerSlot slots[] = null;
	/**
	 * Internal table to store a bunch of user-defined messages. One message can
	 * be defined in several translations, one translation per locale.
	 */
	protected TranslationTable translations = new TranslationTable( );
	/**
	 * The property definition list of all the referencable structure list
	 * property. Each one in the list is instance of <code>IPropertyDefn</code>
	 */
	private HashMap referencableProperties = null;
	/**
	 * Accumulates errors and warnings during a batch operation. Each one is the
	 * instance of <code>Exception</code>.
	 */
	protected List allExceptions = new ArrayList( );
	/**
	 * The validation executor. It performs the semantic validation and sends
	 * validation event to listeners.
	 */
	protected ValidationExecutor validationExecutor = new ValidationExecutor(
			this );
	/**
	 * The listener list for validation event.
	 */
	private List validationListeners = null;
	/**
	 * The file name. Null means that the module has not yet been saved to a