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/attribute/MarkerType.java
* </p>
	 * <!-- end-user-doc -->
	 * @see #BOX
	 * @generated
	 * @ordered
	 */
	public static final MarkerType BOX_LITERAL = new MarkerType( BOX,
			"Box", "Box" ); 
	/**
	 * The '<em><b>Circle</b></em>' literal object.
	 * <!-- begin-user-doc -->
	 * <p>
	 * If the meaning of '<em><b>Circle</b></em>' literal object isn't
	 * clear, there really should be more of a description here...
	 * </p>
	 * <!-- end-user-doc -->
	 * @see #CIRCLE
	 * @generated
	 * @ordered
	 */
	public static final MarkerType CIRCLE_LITERAL = new MarkerType( CIRCLE,
			"Circle", "Circle" ); 
	/**
	 * The '<em><b>Icon</b></em>' literal object.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @see #ICON
	 * @generated
	 * @ordered
	 */