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/Marker.java
* @generated
	 */
	boolean isVisible( );
	/**
	 * Sets the value of the '{@link org.eclipse.birt.chart.model.attribute.Marker#isVisible <em>Visible</em>}' attribute.
	 * <!-- begin-user-doc --> Specifies whether the marker is to be rendered. <!-- end-user-doc -->
	 * @param value the new value of the '<em>Visible</em>' attribute.
	 * @see #isSetVisible()
	 * @see #unsetVisible()
	 * @see #isVisible()
	 * @generated
	 */
	void setVisible( boolean value );
	/**
	 * Unsets the value of the '{@link org.eclipse.birt.chart.model.attribute.Marker#isVisible <em>Visible</em>}' attribute.
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @see #isSetVisible()
	 * @see #isVisible()
	 * @see #setVisible(boolean)
	 * @generated
	 */
	void unsetVisible( );
	/**
	 * Returns whether the value of the '
	 * {@link org.eclipse.birt.chart.model.attribute.Marker#isVisible <em>Visible</em>}' attribute is set. <!--
	 * begin-user-doc --> <!-- end-user-doc -->
	 * 
	 * @return whether the value of the '<em>Visible</em>' attribute is set.
	 * @see #unsetVisible()
	 * @see #isVisible()