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
* file.
	 */
	protected String fileName = null;
	/**
	 * The system id which is needed for resolving relative URIs. It can be a
	 * relative/absolute file directory or a network path such as HTTP, FTP,
	 * etc.
	 */
	protected URL systemId = null;
	/**
	 * The UTF signature.
	 */
	protected String signature = null;
	/**
	 * The default units for the design.
	 */
	protected String units = null;
	/**
	 * All libraries which are included in this module.
	 */
	private List libraries = null;
	/**
	 * The attribute listener list to handle the file name changed events.
	 */
	private List attributeListeners = null;
	/**
	 * Dispose listener list to handle the design disposal events.
	 */
	private List disposeListeners = null;
	/**