This attribute indicates whether the inverse transformation of
the PolyMap should be implemented via an iterative Newton-Raphson
approximation that uses the forward transformation to transform
candidate input positions until an output position is found which
is close to the required output position. By default, an iterative
inverse is provided if, and only if, no inverse polynomial was supplied
when the PolyMap was constructed.
The NiterInverse and TolInverse attributes provide parameters that
control the behaviour of the inverse approcimation method.