Wax_utils.Spell_checkSourceSound-alike and spell-checking utilities.
edit_distance ?limit s0 s1 computes the Damerau-Levenshtein distance between s0 and s1. Returns limit (defaulting to Int.max_int) if the distance is greater than limit.
f ?max_dist iter_dict s returns a list of words from iter_dict that are within max_dist of s. iter_dict is a function that iterates over the dictionary and calls its argument with each word.