Bug 117149 Add additional datapoint markers
I would like to propose adding additional datapoint markers. Attached is a set of markers I would like supported.
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/model/type/TypePackage.java
* The feature id for the '<em><b>Curve</b></em>' attribute. <!--
	 * begin-user-doc --> <!-- end-user-doc -->
	 * 
	 * @generated
	 * @ordered
	 */
	int SCATTER_SERIES__CURVE = LINE_SERIES__CURVE;
	/**
	 * The feature id for the '<em><b>Shadow Color</b></em>' containment reference.
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @generated
	 * @ordered
	 */
	int SCATTER_SERIES__SHADOW_COLOR = LINE_SERIES__SHADOW_COLOR;
	/**
	 * The feature id for the '<em><b>Connect Missing Value</b></em>' attribute.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 * @ordered
	 */
	int SCATTER_SERIES__CONNECT_MISSING_VALUE = LINE_SERIES__CONNECT_MISSING_VALUE;
	/**
	 * The number of structural features of the '<em>Scatter Series</em>' class.
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @generated
	 * @ordered
	 */
	int SCATTER_SERIES_FEATURE_COUNT = LINE_SERIES_FEATURE_COUNT + 0;
	/**