Bug 182895 Support sort on Level attribute.
Currently in OLAP engine we only support sort on level key value. We should go ahead to support sort on level attribute value.
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/olap/data/impl/aggregation/sort/AggrSortHelper.java
{
	/**
	 * 
	 * @param sorts
	 * @param resultSet
	 * @return
	 * @throws DataException
	 * @throws IOException
	 */
	public static IAggregationResultSet sort( List sorts,
			IAggregationResultSet[] resultSet ) throws DataException
	{
		try