CHANGES IN VERSION 0.2.0 NEW FEATURES: - `merge_pairs` combines two sets of pairs into one (like `rbind`). Expecially usefull in combination with `pair_blocking` to generate pairs that are blocked on multiple keys (e.g. they have match on either `postcode` or `lastname`). BUG FIXES: - `pairs_minsim` gave an error when the number of records squared is larger the maximum integer value. - `pairs_minsim` did not generate pairs when one of the keys contained missing values.