Bug 208373 Auto resize Chart to have a single axis without blank
When Chart is within Cross tab, chart axis image should have a single axis only, but there may be much blank in other area. Chart engine should auto resize the image to have the axis with fit size. Meanwhile, report engine should not set size for chart image.
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/computation/withaxes/PlotWith2DAxes.java
"exception.numerical.data.datetime.axis",  
						Messages.getResourceBundle( rtc.getULocale( ) ) );
			}
		}
		else if ( ( iType & NUMERICAL ) == NUMERICAL )
		{
			try
			{
				return new double[]{
						asDouble( oMin ).doubleValue( ),
						asDouble( oMax ).doubleValue( )
				};
			}
			catch ( ClassCastException ex )
			{
				throw new ChartException( ChartEnginePlugin.ID,
						ChartException.DATA_SET,
						"exception.datetime.data.numerical.axis",  
						Messages.getResourceBundle( rtc.getULocale( ) ) );
			}
		}
		return null;
	}
	/**
	 * This method computes the entire chart within the given bounds. If the
	 * dataset has changed but none of the axis attributes have changed, simply
	 * re-compute without 'rebuilding axes'.
	 * 
	 * @param bo
	 *