fix distorted round

[Ofnuts]

Gven four points that are supposed tn be in a circle, t It could be possible to determine the unique Perspective transform that puts them on a circle (unless there are 4 possible such transforms, depending one which point you pick). Three points are not enough because three points are always in a circle. But all this is outside my current math abilities. Maybe ask our resident mathematician, Ottia Tuota.