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
{
		
		ModuleOption options = getModule( ).getOptions( );
		if ( options != null )
			markLineNumber = options.markLineNumber( );
		writer = new IndentableXMLWriter( outputFile, getModule( )
				.getUTFSignature( ), markLineNumber );
		writeFile( );
		writer.close( );
	}
	/**
	 * Writes the report design to the output stream.
	 * 
	 * @param os
	 *            the output stream to which the design is written.
	 * @throws IOException
	 *             if a write error occurs.
	 */
	public void write( OutputStream os ) throws IOException
	{
		
		ModuleOption options = getModule( ).getOptions( );
		if ( options != null )
			markLineNumber = options.markLineNumber( );
		writer = new IndentableXMLWriter( os, getModule( ).getUTFSignature( ),
				markLineNumber );
		writeFile( );
	}
	/**
	 * Implementation method to write the file header and contents.