determines the orientation of the points of the tuple
A = tuple [first,last) where A consists of d + 1 points in
d-space. This is the sign of the determinant
where A[i] denotes the Cartesian coordinate vector of
the i-th point in A.
|Precondition: ||size [first,last) == d+1 and
A[i].dimension() == d ∀ 0 ≤ i ≤ d.
|Requirement: ||The value type of ForwardIterator is