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
prop );
		if ( list == null || list.size( ) == 0 )
			return;
		writer.startElement( DesignSchemaConstants.LIST_PROPERTY_TAG );
		writer.attribute( DesignSchemaConstants.NAME_ATTRIB, memberName );
		Iterator iter = list.iterator( );
		while ( iter.hasNext( ) )
		{
			IStructure struct = (IStructure) iter.next( );
			writer.startElement( DesignSchemaConstants.STRUCTURE_TAG );
			Iterator memberIter = prop.getStructDefn( ).propertiesIterator( );
			while ( memberIter.hasNext( ) )
			{
				PropertyDefn memberDefn = (PropertyDefn) memberIter.next( );
				
				
				
				writeMember( struct, memberDefn );
			}
			writer.endElement( );
		}
		writer.endElement( );
	}
	/**
	 * Writes user property definitions.
	 * 
	 * @param obj
	 *            the element that contains user properties
	 */
	protected void writeUserPropertyDefns( DesignElement obj )