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
ColumnDesign column = new ColumnDesign( );
					readColumn( buffer, column );
					table.addColumn( column );
				}
				break;
			default :
				readListingField( in, table, fieldType );
		}
	}
	protected void readTableGroup( DataInputStream in,
			TableGroupDesign tableGroup ) throws IOException
	{
		while ( in.available( ) > 0 )
		{
			short fieldType = IOUtil.readShort( in );
			readTableGroupField( in, tableGroup, fieldType );
		}
	}
	protected void readTableGroupField( DataInputStream in,
			TableGroupDesign group, short fieldType ) throws IOException
	{
		readGroupField( in, group, fieldType );
	}
	protected void readTableBand( DataInputStream in, TableBandDesign tableBand )
			throws IOException
	{
		while ( in.available( ) > 0 )
		{
			short fieldType = IOUtil.readShort( in );
			readTableBandField( in, tableBand, fieldType );