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/impl/LineSeriesImpl.java
* (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.chart.model.component.Series#canShareAxisUnit()
	 */
	public final boolean canShareAxisUnit( )
	{
		return true;
	}
	/**
	 * A convenience method to create an initialized 'Series' instance
	 * 
	 * @return
	 */
	public static Series create( ) 
	{
		final LineSeries ls = TypeFactory.eINSTANCE.createLineSeries( );
		( (LineSeriesImpl) ls ).initialize( );
		return ls;
	}
	/**
	 * Initializes all member variables within this object recursively
	 * 
	 * Note: Manually written
	 */
	protected void initialize( ) 
	{
		super.initialize( );
		final LineAttributes lia = AttributeFactory.eINSTANCE.createLineAttributes( );
		( (LineAttributesImpl) lia ).set( ColorDefinitionImpl.BLACK( ),
				LineStyle.SOLID_LITERAL,