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
{
					ListBandDesign footer = (ListBandDesign) readDesign( in );
					list.setFooter( footer );
				}
				return list;
			}
			case LIST_GROUP_DESIGN :
			{
				ListGroupDesign listGroup = new ListGroupDesign( );
				readListGroup( dis, listGroup );
				
				if ( IOUtil.readBool( in ) )
				{
					ListBandDesign groupHeader = (ListBandDesign) readDesign( in );
					listGroup.setHeader( groupHeader );
				}
				
				if ( IOUtil.readBool( in ) )
				{
					ListBandDesign footer = (ListBandDesign) readDesign( in );
					listGroup.setFooter( footer );
				}
				return listGroup;
			}
			case LIST_BAND_DESIGN :
			{
				ListBandDesign listBand = new ListBandDesign( );
				readListBand( dis, listBand );
				
				int count = IOUtil.readInt( in );