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.tests/test/org/eclipse/birt/report/model/parser/TabularCubeParserTest.java
propHandle = level
				.getPropertyHandle( LevelHandle.VALUE_ACCESS_CONTROLS_PROP );
		valueAccess = designHandle.getElementFactory( ).newValueAccessControl( );
		propHandle.add( valueAccess );
		
		cube.add( TabularCubeHandle.MEASURE_GROUPS_PROP, factory
				.newTabularMeasureGroup( null ) );
		MeasureGroupHandle measureGroup = (MeasureGroupHandle) cube.getContent(
				TabularCubeHandle.MEASURE_GROUPS_PROP, 0 );
		measureGroup.setName( namePrix + measureGroup.getName( ) );
		
		measureGroup.add( MeasureGroupHandle.MEASURES_PROP, factory
				.newTabularMeasure( null ) );
		MeasureHandle measure = (MeasureHandle) measureGroup.getContent(
				MeasureGroupHandle.MEASURES_PROP, 0 );
		measure.setName( namePrix + measure.getName( ) );
		measure.setMeasureExpression( valuePrix
				+ measure.getMeasureExpression( ) );
		measure.setFunction( DesignChoiceConstants.MEASURE_FUNCTION_COUNT );
		measure.setCalculated( true );
		measure.setDataType( DesignChoiceConstants.COLUMN_DATA_TYPE_BOOLEAN );
		save( );
		saveOutputFile( "CubeParserTest_golden.xml" );
		assertTrue( compareFile( "CubeParserTest_golden.xml" ) ); 
	}
	/**
	 * 
	 * @throws Exception
	 */