tors.splitvar
 fit.fit_points.evaluation_vectors.lo
 fit.fit_points.evaluation_vectors.hi
 fit.fit_points.fit_limits (d*2 matrix)
 fit.fit_points.family_link (numeric values)
 fit.fit_points.kappa (likelihood, degrees of freedom, etc)

 fit.parametric_component


  The OLD format:

    fit{1} = data.
    fit{2} = evaluation structure.
    fit{3} = smoothing parameter structure.
    fit{4}{1} = fit points matrix.
    fit{4}{2} = matrix of fitted values etc.
           Note that these are not