- round the pie radius down to avoid running over the edge of the

 - round the pie radius down to avoid running over the edge of the
   image

 - changed the pie maxsegments default to 0.01 from 0.05

 - removed the obsolete pie blur style information

 - documented some of the pie chart specific style settings

 - changed the default drop shadow style to a translucent fill so the
   background can show through.