Bug 156969 [regression]Group header repeat doesn't work in Web Viewer.
Description: Group header repeat doesn't work in Web Viewer. Steps to reproduce: 1. New a data source and dataset, drag the dataset to Layout. 2. Add a group. 3. Set page break in the first data item in table detail row. 4. Preview in web viewer&#12290; Expected result: Group header is repeated in each page. Actual result: No group header repeat effect.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/ir/EngineIRReader.java
{
				FreeFormItemDesign freeForm = new FreeFormItemDesign( );
				readFreeForm( dis, freeForm );
				int count = IOUtil.readInt( in );
				for ( int i = 0; i < count; i++ )
				{
					ReportItemDesign item = (ReportItemDesign) readDesign( in );
					freeForm.addItem( item );
				}
				return freeForm;
			}
			case ROW_DESIGN :
			{
				RowDesign row = new RowDesign( );
				readRow( dis, row );
				int count = IOUtil.readInt( in );
				for ( int i = 0; i < count; i++ )
				{
					CellDesign cell = (CellDesign) readDesign( in );
					row.addCell( cell );
				}
				return row;
			}
			case CELL_DESIGN :
			{
				CellDesign cell = new CellDesign( );
				readCell( dis, cell );
				int count = IOUtil.readInt( in );
				for ( int i = 0; i < count; i++ )
				{