Tool to solve torus problems

[Max Martin Richter]

I will check this. I found the problem. The inner calculation was right, but there was a boolean, that wasn't reset when restart the calculation. Will be gone in the next version. I have also implement that the programme don't except negative values for the inner radius and checks if the outer radius is greater than the inner one.
Nevertheless I hope, that I can implement a y-scale area today, after this there will be more bug fixing (if necessary) and maybe I make a GUI, too.

/Max