UnaryFunction0D and UnaryFunction1D implementations are going to be really challenging due to the changes in the infrastructure: UnaryFunction0D<T> and UnaryFunction0D<T> are templates and must be determined for compile-time. The easiest solution is to support each type individually; unfortunately, it removes the benefit of using an interface. To find a middle ground, a general unary function Python object type was created for 0D and 1D. In both cases, the types have a void* pointer keeping the address of the current unary function type. I am not sure yet if it will work.
Interface0DIterator being removed by a list type, the t() and u() coordinate functions will to be transferred somehow, probably directly at the Interface0D level.
