Calculates the spline coefficients a(i), b(i), c(i), d(i) for a spline
with a given 1st derivative vector. Uses the coefficients calculated by
`SplineA` and `SplineB1`.
Namespace:Altaxo.Calc.Interpolation Assembly: AltaxoCore (in AltaxoCore.dll) Version: 4.8.3448.0 (4.8.3448.0)