SQL functions find_comments_* now return VotesAggregates

create Votable Interface
remove usless "resourceTarget" argument for SQL function "count_vote"

src/main/resources/sql/functions/article/find_articles.sql

@@ -15,7 +15,7 @@ begin
         select
             a.*,
             find_citizen_by_id(a.created_by_id) as created_by,
-            count_vote('article', a.id) as votes,
+            count_vote(a.id) as votes,
             zdb.score(a.ctid) _score
         from article as a
         where (