Add Auto option for Box, Column and Bar graph's pattern fill color. When Auto is on, Fill color is slightly lighter than Border color. A new system variable @PFACF is introduced with default value as 65. Auto Fill color will be lighter when number increases. 

Auto option for distribution curve in Box chart and Histogram also changed to follow the same logic. And a new system variable @PDACF is introduced with default value as 30. Auto distribution cuve color will be darker when number increases.