Bug 207268 Add visibility option for plot within axes
For chart with axes, we should make plot within axes invisible. Meantime, other plots, such as axes, legend and title, should be visible. This enhancement doesn't include UI change, and it is required for cross tab integration.
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/render/AxesRenderer.java
* Returns if current chart is transposed.
	 */
	public final boolean isTransposed( )
	{
		return ( (ChartWithAxes) getModel( ) ).isTransposed( );
	}
	/**
	 * Returns previous visible series index by given index.
	 * 
	 * @param currentIndex
	 * @return
	 */
	protected int getPrevVisibleSiblingSeriesIndex( int currentIndex )
	{
		SeriesDefinition sd = null;
		Series se = getSeries( );
		if ( se.eContainer( ) instanceof SeriesDefinition )
		{
			sd = (SeriesDefinition) se.eContainer( );
		}
		if ( sd != null )
		{
			int count = 0;
			int idx = sd.getRunTimeSeries( ).indexOf( se );
			if ( idx > 0 )
			{
				for ( int i = idx - 1; i >= 0; i-- )
				{
					count++;
					if ( ( (Series) sd.getRunTimeSeries( ).get( i ) ).isVisible( ) )