Bug 190058 icon for aggregation type data items.
For aggregation type data items in cross tabs, we should show the icon instead of the sigma symbol. I am attaching the icon to replace it
xtab/org.eclipse.birt.report.item.crosstab.ui/src/org/eclipse/birt/report/item/crosstab/internal/ui/editors/editparts/MeasureAggregationEditPart.java
{
	
	/**Constructor
	 * @param model
	 */
	public MeasureAggregationEditPart( Object model )
	{
		super( model );
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.birt.report.designer.internal.ui.editors.schematic.editparts.DataEditPart#getText()
	 */
	protected String getText( )
	{