removed default setting symm=true for glass again
increaded the pulling time, so you get an answer with pixrad = 8
changed some styles to be better visible (contours)
contour path: min-max-sad: better algo for getting bezier helper points

fixes #3
updated json decoder
fixes #20
fix missing cpnt parent
fixes #19
implemented better algo for detecting crossings of contour, and switched it off altogether at the end..
fixes #18
several ui fixes