[DynareDev] PosteriorFilterSmootherAndForecast.m

Dear all, In Master we have a function PosteriorFilterSmootherAndForecast.m that seems not be called by any other function. Does anyone know whether it is still used? If not, I would prefer to delete it rather than try to fix the trend and prefiltering bugs still present in that function. A quick and short feedback would be highly appreciated. Best, Johannes