Bug 148755 Add tthe status to the ActivityStackEvent.
If the the event rollback, the ActivityStackEvent status should be ROLL_BACK.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/activity/ActivityStack.java
private int stackLimit = DEFAULT_STACK_LIMIT;
	/**
	 * The transaction counter. Incremented for each new transaction, including
	 * simple top-level commands.
	 */
	private int transCount = 0;
	/**
	 * Listeners are the objects that want to be notified of events. Contents
	 * are of type Listener. Created only when needed.
	 */
	protected ArrayList listeners = null;
	/**
	 * Default constructor.
	 */
	public ActivityStack( )
	{
	}
	/**
	 * Executes the specified extended element command. The command must be
	 * ready to execute. As noted above, any required checks must have already
	 * been done. Flushes the redo stack.
	 * 
	 * @param command
	 *            the ActivityRecord to execute
	 */
	public void execute( IElementCommand command )
	{
		ExtensionActivityRecord record = new ExtensionActivityRecord( command );
		
		assert record != null;