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
readSimpleMasterPage( dis, masterPage );
				
				int count = IOUtil.readInt( in );
				for ( int i = 0; i < count; i++ )
				{
					ReportItemDesign item = (ReportItemDesign) readDesign( in );
					masterPage.addHeader( item );
				}
				count = IOUtil.readInt( in );
				for ( int i = 0; i < count; i++ )
				{
					ReportItemDesign item = (ReportItemDesign) readDesign( in );
					masterPage.addFooter( item );
				}
				return masterPage;
			}
			case GRID_DESIGN :
			{
				GridItemDesign grid = new GridItemDesign( );
				readGrid( dis, grid );
				
				int count = IOUtil.readInt( in );
				for ( int i = 0; i < count; i++ )
				{
					RowDesign row = (RowDesign) readDesign( in );
					grid.addRow( row );
				}
				return grid;
			}
			case FREE_FORM_DESIGN :