Pie / Donut charts

[johanndt]

Please don't shoot me, but I'd just like to put in a request for pie or donut style charts. Yes I know data scientists abhor them. And I know they show only relative values not absolute. But sadly we deal with pointy haired bosses every day who love their pie charts.

At the moment we use reportlab for it - but I find the API very clunky compared to toyplot. Maybe even a wrapper around reportlab would be good enough?