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/impl/MarkerImpl.java
* @generated
	 */
	public void setVisible( boolean newVisible )
	{
		boolean oldVisible = visible;
		visible = newVisible;
		boolean oldVisibleESet = visibleESet;
		visibleESet = true;
		if ( eNotificationRequired( ) )
			eNotify( new ENotificationImpl( this,
					Notification.SET,
					AttributePackage.MARKER__VISIBLE,
					oldVisible,
					visible,
					!oldVisibleESet ) );
	}
	/**
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @generated
	 */
	public void unsetVisible( )
	{
		boolean oldVisible = visible;
		boolean oldVisibleESet = visibleESet;
		visible = VISIBLE_EDEFAULT;
		visibleESet = false;
		if ( eNotificationRequired( ) )
			eNotify( new ENotificationImpl( this,
					Notification.UNSET,
					AttributePackage.MARKER__VISIBLE,