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
outer.append( record );
		}
	}
	/**
	 * Undoes all actions done so far in the innermost transaction. Does not
	 * undo any parent transactions.
	 */
	public void rollback( )
	{
		assert transStack.size( ) > 0;
		CompoundRecord trans = (CompoundRecord) transStack.pop( );
		
		
		trans.rollback( );
		trans.destroy( );
	}
	/**
	 * Undoes an entire uncommitted transaction. Provides the application a way
	 * to reverse a set of operations that must be abandoned. For example, the
	 * application may implement a user-level operation as a series of
	 * operations. If any of the operations fail, the application wants to undo
	 * all the changes made so far in that transaction.
	 */
	public void rollbackAll( )
	{
		while ( !transStack.isEmpty( ) )
			rollback( );
	}
	/**
	 * Returns the current transaction number. This is either the command just