Bug 188578 Add "displayColumnName" on TabularLevel
Add Property "displayColumnName" on TabbularLevel and corresponding APIs on handle. Property Type: expression.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/writer/ModuleWriter.java
public void visitList( ListItem obj )
	{
		
		boundColumnsMgr.dealList( obj, getModule( ) );
		writer.startElement( DesignSchemaConstants.LIST_TAG );
		super.visitList( obj );
		writeContents( obj, IListingElementModel.HEADER_SLOT,
				DesignSchemaConstants.HEADER_TAG );
		
		
		writeContents( obj, IListingElementModel.GROUP_SLOT, null );
		writeContents( obj, IListingElementModel.DETAIL_SLOT,
				DesignSchemaConstants.DETAIL_TAG );
		writeContents( obj, IListingElementModel.FOOTER_SLOT,
				DesignSchemaConstants.FOOTER_TAG );
		writer.endElement( );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.model.design.elements.DesignVisitor#visitListGroup(org.eclipse.birt.report.model.design.elements.ListGroup)
	 */
	public void visitListGroup( ListGroup obj )
	{
		writer.startElement( DesignSchemaConstants.GROUP_TAG );
		super.visitListGroup( obj );
		writeContents( obj, IGroupElementModel.HEADER_SLOT,
				DesignSchemaConstants.HEADER_TAG );
		writeContents( obj, IGroupElementModel.FOOTER_SLOT,
				DesignSchemaConstants.FOOTER_TAG );