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
* @throws Exception
	 */
	public void testParser( ) throws Exception
	{
		openDesign( FILE_NAME );
		assertNotNull( designHandle );
		
		TabularCubeHandle cube = (TabularCubeHandle) designHandle
				.findCube( "testCube" ); 
		assertEquals(
				designHandle.findDataSet( "firstDataSet" ), cube.getDataSet( ) ); 
		
		Iterator iter = cube.filtersIterator( );
		FilterConditionHandle filterConditionHandle = (FilterConditionHandle) iter
				.next( );
		assertEquals( "filter expression", filterConditionHandle.getExpr( ) ); 
		
		iter = cube.joinConditionsIterator( );
		DimensionConditionHandle cubeJoinConditionHandle = (DimensionConditionHandle) iter
				.next( );
		assertEquals(
				design.findOLAPElement( "testHierarchy" ), cubeJoinConditionHandle.getHierarchy( ).getElement( ) ); 		
		MemberHandle conditionMemberHandle = cubeJoinConditionHandle
				.getJoinConditions( );
		assertEquals( 3, conditionMemberHandle.getListValue( ).size( ) );
		DimensionJoinConditionHandle joinCondition = (DimensionJoinConditionHandle) conditionMemberHandle
				.getAt( 0 );
		assertEquals( "cubeKey", joinCondition.getCubeKey( ) ); 
		assertEquals( "key", joinCondition.getHierarchyKey( ) ); 
		joinCondition = (DimensionJoinConditionHandle) conditionMemberHandle