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
for ( int i = 0; i < masterPageCount; i++ )
		{
			SimpleMasterPageDesign masterPage = (SimpleMasterPageDesign) readDesign( dis );
			pageSetup.addMasterPage( masterPage );
		}
		
		int count = IOUtil.readInt( dis );
		for ( int i = 0; i < count; i++ )
		{
			ReportItemDesign item = (ReportItemDesign) readDesign( dis );
			reportDesign.addContent( item );
		}
		return reportDesign;
	}
	public void link( Report report, ReportDesignHandle handle )
	{
		new ReportItemVisitor( handle, report ).link( );
	}
	protected Object readDesign( DataInputStream in ) throws IOException
	{
		
		short designType = IOUtil.readShort( in );
		byte[] buffer = IOUtil.readBytes( in );
		DataInputStream dis = new DataInputStream( new ByteArrayInputStream(
				buffer ) );
		switch ( designType )
		{
			case SIMPLE_MASTER_PAGE_DESIGN :
			{
				SimpleMasterPageDesign masterPage = new SimpleMasterPageDesign( );