incricle for zero oriented primitives

[skariel]

a = Point(1.1, 1.1)
b = Point(1.2, 1.2)
c = Point(1.3, 1.3)
mytriangle = Primitive(a, b, c)
incircle(mytriangle, Point(1.25, 1.25))

gives 2, should give 0

[skariel]

fixed in latest commit!