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
structHandle = (DimensionConditionHandle) propHandle.get( 0 );
		MemberHandle memberHandle = structHandle
				.getMember( DimensionCondition.HIERARCHY_MEMBER );
		memberHandle.setValue( valuePrix + "hierarchy" ); 
		structHandle.removeJoinCondition( 1 );
		
		AccessControlHandle accessControl = (AccessControlHandle) cube
				.accessControlsIterator( ).next( );
		accessControl.addUserName( "new cube user1" ); 
		accessControl.addUserName( "new cube user2" ); 
		accessControl.addRole( "new cube role1" ); 
		accessControl.addRole( "new cube role2" ); 
		accessControl
				.setPermission( DesignChoiceConstants.ACCESS_PERMISSION_ALLOW );
		
		propHandle = cube
				.getPropertyHandle( TabularCubeHandle.ACCESS_CONTROLS_PROP );
		accessControl = designHandle.getElementFactory( ).newAccessControl( );
		propHandle.add( accessControl );
		
		cube.add( TabularCubeHandle.DIMENSIONS_PROP, factory
				.newTabularDimension( null ) );
		DimensionHandle dimension = (DimensionHandle) cube.getContent(
				TabularCubeHandle.DIMENSIONS_PROP, 0 );
		dimension.setName( namePrix + dimension.getName( ) );
		dimension.setTimeType( false );
		dimension.setDefaultHierarchy( factory
				.newTabularHierarchy( "testDefaultHierarchy" ) ); 
		
		dimension.add( DimensionHandle.HIERARCHIES_PROP, factory