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
* clear, there really should be more of a description here...
	 * </p>
	 * <!-- end-user-doc -->
	 * @see #CROSSHAIR
	 * @generated
	 * @ordered
	 */
	public static final MarkerType CROSSHAIR_LITERAL = new MarkerType( CROSSHAIR,
			"Crosshair", "Crosshair" ); 
	/**
	 * The '<em><b>Triangle</b></em>' literal object.
	 * <!-- begin-user-doc
	 * -->
	 * <p>
	 * If the meaning of '<em><b>Triangle</b></em>' literal object isn't
	 * clear, there really should be more of a description here...
	 * </p>
	 * <!-- end-user-doc -->
	 * @see #TRIANGLE
	 * @generated
	 * @ordered
	 */
	public static final MarkerType TRIANGLE_LITERAL = new MarkerType( TRIANGLE,
			"Triangle", "Triangle" ); 
	/**
	 * The '<em><b>Box</b></em>' literal object.
	 * <!-- begin-user-doc -->
	 * <p>
	 * If the meaning of '<em><b>Box</b></em>' literal object isn't clear,
	 * there really should be more of a description here...