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
gl.marginHeight = 0;
		
		inputArea = new Composite( listArea, SWT.NONE );
		GridData gdInputArea = new GridData( GridData.FILL_BOTH
				| GridData.HORIZONTAL_ALIGN_BEGINNING );
		inputArea.setLayoutData( gdInputArea );
		inputArea.setLayout( gl );
		iconList = new List( listArea, SWT.SINGLE
				| SWT.BORDER
				| SWT.V_SCROLL
				| SWT.H_SCROLL );
		GridData gdIconList = new GridData( GridData.FILL_HORIZONTAL );
		gdIconList.heightHint = 120;
		iconList.setLayoutData( gdIconList );
		iconList.addSelectionListener( this );
		if ( iconPalette != null )
		{
			for ( int i = 0; i < iconPalette.getEntries( ).size( ); i++ )
			{
				iconList.add( ( (Image) iconPalette.getEntries( ).get( i ) ).getURL( ) );
			}
		}
		btnRemove = new Button( listArea, SWT.NONE );
		btnRemove.setLayoutData( new GridData( GridData.HORIZONTAL_ALIGN_END ) );
		btnRemove.setText( Messages.getString( "MarkerIconDialog.Lbl.Remove" ) ); 
		btnRemove.addSelectionListener( this );
	}
	/**
	 * Preview Area locates in the right middle of the dialog.
	 *