ix: fractrace parameter programme

The iterative process performed in the programme 'fractrace' is shown below.

It was necessary to add a small but finite number in the denominators to avoid nasty divergences in the numerical evaluation. This is not a satisfactory procedure because it introduces a small deformation that should not be there. Recall that the scator product is closed in the $\mathbb{S}_{-}^{1+n}$ set, so it should be possible to solve this problem in a better way.