#' @param df Data frame with actor ids, produced by sentencizer
#' @param actors_meta Data frame containing actor metadata obtained using elasticizer(index="actors")
#' @param actors_meta Optional data frame containing actor metadata obtained using elasticizer(index="actors")
#' @param actor_groups Optional list of vectors, where each vector contains actor ids to be merged (e.g. merge all left-wing parties)
#' @param pos_cutoff Optional value above which sentence-level sentiment scores should be considered "positive"
#' @param neg_cutoff Optional value below which sentence-level sentiment scores should be considered "negative"
#' @return When no ids, returns actor-article dataset with individual actors, party aggregations, party-actor aggregations and overall actor sentiment (regardless of specific actors). When ids, returns aggregations for each vector in list