修正的bug: 
- If ScrollBarScale property was not set in AxisX then while adding DataPoints at runtime, Chart was not behaving as expected.
  
增强: 
- Pie label placement algorithm has been improved. We have introduced
a new property called SmartLabelEnabled in Chart. If SmartLabelEnabled
property is set to True, the Pie/Doughnut labels which overlap will be
skipped automatically. This property is very useful when labels are
dense. Please check documentation for more detail.
 - MaxWidth and MaxHeight properties have been introduced in Legend.
Now you will be able to set the maximum width and height of Legend.
 - Now LabelAngle property will be applicable for Point and Bubble charts also.
 - By default Legend will be disabled for
Pie/Doughnut/StreamLineFunnel/SectionFunnel charts. You can enable
Legend by setting ShowInLegend property in DataSeries.
 - For Pie/Doughnut/StreamLineFunnel/SectionFunnel, the default value for LabelText property will be #AxisXLabel,#YValue.
 - If LabelStyle property is set in DataSeries/DataPoint, auto placement for DataPoint labels will not work.
  
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