#' \item{\code{getStdHorizon()}}{
#' Number of time steps from serie[1] until midnight}
#' \item{\code{append(time, serie, exo, exo_hat)}}{
#' \item{\code{getStdHorizon()}}{
#' Number of time steps from serie[1] until midnight}
#' \item{\code{append(time, serie, exo, exo_hat)}}{