Bug 141064 Remove group level data binding
This bug covers the engine part of the task to remove group level data binding. After the hange, all binding expressions will be defined on the table level, and each binding expression will have an AggregateOn field to explicitly define the group level for that expression.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/data/dte/ReportQueryBuilder.java
*/
		protected void handleTableGroup( TableGroupDesign group,
				GroupHandle handle, Object value )
		{
			IGroupDefinition groupDefn = handleGroup( group, handle );
			pushQuery( groupDefn );
			handleTableBand( group.getHeader( ), value );
			handleTableBand( group.getFooter( ), value );
			popQuery( );
		}
		/**
		 * visit content of a row
		 */
		protected void handleRow( RowDesign row, Object value )
		{
			transferExpressions( row );
			for ( int i = 0; i < row.getCellCount( ); i++ )
			{
				CellDesign cell = row.getCell( i );
				if ( cell != null )
				{
					handleCell( cell, value );
				}
			}
		}
		/**
		 * handles a cell in a row
		 */
		protected void handleCell( CellDesign cell, Object value )
		{