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.ui.extension/src/org/eclipse/birt/chart/ui/swt/composites/MarkerIconDialog.java
composite.setLayout( new GridLayout( 2, false ) );
		Label label = new Label( composite, SWT.NONE );
		label.setText( Messages.getString( "MarkerIconDialog.Lbl.SelectIconFrom" ) ); 
		label.setLayoutData( new GridData( GridData.VERTICAL_ALIGN_BEGINNING ) );
		Composite selectionArea = new Composite( composite, SWT.NONE );
		selectionArea.setLayout( new FillLayout( SWT.VERTICAL ) );
		btnURL = new Button( selectionArea, SWT.RADIO );
		btnURL.setText( Messages.getString( "MarkerIconDialog.Lbl.URL" ) ); 
		btnURL.addSelectionListener( this );
		btnLocal = new Button( selectionArea, SWT.RADIO );
		btnLocal.setText( Messages.getString( "MarkerIconDialog.Lbl.Local" ) ); 
		btnLocal.addSelectionListener( this );
	}
	/**
	 * List Area locates in the left middle of the dialog.
	 * 
	 * @param parent
	 *            dialog composite
	 */
	private void createListArea( Composite parent )
	{
		Composite listArea = new Composite( parent, SWT.NONE );
		GridData gd = new GridData( GridData.FILL_BOTH
				| GridData.HORIZONTAL_ALIGN_BEGINNING );
		gd.widthHint = 300;
		gd.heightHint = 260;
		listArea.setLayoutData( gd );
		listArea.setLayout( new GridLayout( ) );
		GridLayout gl = new GridLayout( );
		gl.marginWidth = 0;