Modified pie chart to use tuple index as key; added getTooltipText function to get the proper tooltip for the pie slice (using label, formatted value and percent); fixed title position for bottom title. removed legend for pie chart (we probably have to implement our own).
Modified pie chart to use tuple index as key; added getTooltipText function to get the proper tooltip for the pie slice (using label, formatted value and percent); fixed title position for bottom title. removed legend for pie chart (we probably have to implement our own).

rpbouman/xavier,rpbouman/xavier