Bug 207268 Add visibility option for plot within axes
For chart with axes, we should make plot within axes invisible. Meantime, other plots, such as axes, legend and title, should be visible. This enhancement doesn't include UI change, and it is required for cross tab integration.
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/model/layout/impl/LayoutPackageImpl.java
* are initialized, since one package's meta-model objects may refer to
	 * those of another.
	 * <p>Invocation of this method will not affect any packages that have
	 * already been initialized.
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @see #eNS_URI
	 * @see #createPackageContents()
	 * @see #initializePackageContents()
	 * @generated
	 */
	public static LayoutPackage init( )
	{
		if ( isInited )
			return (LayoutPackage) EPackage.Registry.INSTANCE.getEPackage( LayoutPackage.eNS_URI );
		
		LayoutPackageImpl theLayoutPackage = (LayoutPackageImpl) ( EPackage.Registry.INSTANCE.getEPackage( eNS_URI ) instanceof LayoutPackageImpl ? EPackage.Registry.INSTANCE.getEPackage( eNS_URI )
				: new LayoutPackageImpl( ) );
		isInited = true;
		
		XMLTypePackage.eINSTANCE.eClass( );
		
		ComponentPackageImpl theComponentPackage = (ComponentPackageImpl) ( EPackage.Registry.INSTANCE.getEPackage( ComponentPackage.eNS_URI ) instanceof ComponentPackageImpl ? EPackage.Registry.INSTANCE.getEPackage( ComponentPackage.eNS_URI )
				: ComponentPackage.eINSTANCE );
		DataPackageImpl theDataPackage = (DataPackageImpl) ( EPackage.Registry.INSTANCE.getEPackage( DataPackage.eNS_URI ) instanceof DataPackageImpl ? EPackage.Registry.INSTANCE.getEPackage( DataPackage.eNS_URI )
				: DataPackage.eINSTANCE );
		AttributePackageImpl theAttributePackage = (AttributePackageImpl) ( EPackage.Registry.INSTANCE.getEPackage( AttributePackage.eNS_URI ) instanceof AttributePackageImpl ? EPackage.Registry.INSTANCE.getEPackage( AttributePackage.eNS_URI )
				: AttributePackage.eINSTANCE );
		ModelPackageImpl theModelPackage = (ModelPackageImpl) ( EPackage.Registry.INSTANCE.getEPackage( ModelPackage.eNS_URI ) instanceof ModelPackageImpl ? EPackage.Registry.INSTANCE.getEPackage( ModelPackage.eNS_URI )
				: ModelPackage.eINSTANCE );
		TypePackageImpl theTypePackage = (TypePackageImpl) ( EPackage.Registry.INSTANCE.getEPackage( TypePackage.eNS_URI ) instanceof TypePackageImpl ? EPackage.Registry.INSTANCE.getEPackage( TypePackage.eNS_URI )