Output search-matched numerator and denominator features from Qarcoal

[gibsramen]

Brought up on the Q2 forums.

Currently, given a numerator and denominator string to search, Qarcoal only outputs the sum of features in the numerator and the denominator. Would be useful to also output the features themselves (Qurro already does this).

May require some refactoring of the directory format if the feature outputs are going to be new file(s).