Bug 189363 The aggregation of table should be start with sigma symbol
Description: Follow the spec, after specify a aggregation on a table, the aggregation should be represented by starting with the sigma symbol
xtab/org.eclipse.birt.report.item.crosstab.ui/src/org/eclipse/birt/report/item/crosstab/internal/ui/editors/action/AddSubTotalAction.java
public List getMeasures( )
		{
			return measures;
		}
	}
	private List getSubTotalInfo( )
	{
		List retValue = new ArrayList( );
		DimensionViewHandle viewHandle = getDimensionViewHandle( );
		CrosstabReportItemHandle reportHandle = viewHandle.getCrosstab( );
		int count = viewHandle.getLevelCount( );
		int measureCount = reportHandle.getMeasureCount( );
		LevelViewHandle lastLevelHandle = getLastLevelViewHandle( );
		for ( int i = 0; i < count; i++ )
		{
			LevelViewHandle tempViewHandle = viewHandle.getLevel( i );
			if ( tempViewHandle == lastLevelHandle )
			{
				continue;
			}
			LevelHandle tempHandle = tempViewHandle.getCubeLevel( );
			for ( int j = 0; j < measureCount; j++ )
			{
				AggregationDialog.SubTotalInfo info = new AggregationDialog.SubTotalInfo( );
				info.setLevel( tempHandle );
				info.setAggregateOnMeasure( reportHandle.getMeasure( j )
						.getCubeMeasure( ) );
				retValue.add( info );
			}
		}