Comment 19 for bug 1318221

Maybe we can finish the furthest time 2Geom work, I havent enoght math mind to finish myself:
https://github.com/jabiertxof/lib2geom/tree/furthestTime
Is mostly finished but there is things to finish. I think the code we need is done but need more to be merged on trunk.
Whith this you can do:
Furhhest time from center point1
Furthest time from point1 for point2
Nearest time from BBOX to point 3
Calculate the center of circle by 3 points.

The last thing to do is make working also in groups not only shapes or curves, for this maybe we can locate all centers of each curve/shape and make the center of small enclosing circle on it.
 This work need to be done in C++, for real use in UI transforms, extensions usaly are python code not in real flow.

BUt this is whath i do but remember maybe is not the best/efficient way to do.
Ping me if you need more help.