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/LineSeries.java
* <!-- begin-user-doc --> <!-- end-user-doc -->
	 * <!-- begin-model-doc -->
	 * 
	 * 							Indicates whether the line segments joining data points in the series are to be drawn as curves or as straight lines.
	 * 							
	 * <!-- end-model-doc -->
	 * @return the value of the '<em>Curve</em>' attribute.
	 * @see #isSetCurve()
	 * @see #unsetCurve()
	 * @see #setCurve(boolean)
	 * @see org.eclipse.birt.chart.model.type.TypePackage#getLineSeries_Curve()
	 * @model unique="false" unsettable="true" dataType="org.eclipse.emf.ecore.xml.type.Boolean" required="true"
	 *        extendedMetaData="kind='element' name='Curve'"
	 * @generated
	 */
	boolean isCurve( );
	/**
	 * Sets the value of the '{@link org.eclipse.birt.chart.model.type.LineSeries#isCurve <em>Curve</em>}' attribute.
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @param value the new value of the '<em>Curve</em>' attribute.
	 * @see #isSetCurve()
	 * @see #unsetCurve()
	 * @see #isCurve()
	 * @generated
	 */
	void setCurve( boolean value );
	/**
	 * Unsets the value of the '{@link org.eclipse.birt.chart.model.type.LineSeries#isCurve <em>Curve</em>}' attribute.
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @see #isSetCurve()