Runs model fitting, error estimation and variable importance on fold level
runreps(current_sample = NULL, data = NULL, formula = NULL, model_args = NULL, par_cl = NULL, do_gc = NULL, imp_one_rep = NULL, model_fun = NULL, pred_fun = NULL, imp_variables = NULL, imp_permutations = NULL, err_fun = NULL, importance = NULL, current_res = NULL, current_impo = NULL, pred_args = NULL, progress = NULL, pooled_obs_train = NULL, pooled_obs_test = NULL, pooled_pred_train = NULL, response = NULL, is_factor_prediction = NULL, pooled_pred_test = NULL, test_fun = NULL, test_param = NULL, train_fun = NULL, train_param = NULL, coords = NULL, par_mode = NULL, i = NULL)