Evaluation functions: exact match (#62)
Evaluation functions: exact match (#62)

- Changed what was previously called EXACT-MATCH to
EXACT-MATCH-SCORE
- Created a new EXACT-MATCH function which returns the sentences of
LIST-SENT1 which are an exact match to the corresponding sentence of
LIST-SENT2.
- Changed EXACT-MATCH-SENTENCE to return the first sentence in case of
exact match, instead of returning T.
own-pt/cl-conllu