move vote similarity code into danbooru, add listing for super voters

app/models/post_vote.rb

@@ -12,6 +12,18 @@ class PostVote < ActiveRecord::Base
     where("created_at < ?", 30.days.ago).delete_all
   end
 
+  def self.positive_user_ids
+    select_values_sql("select user_id from post_votes where score > 0 group by user_id having count(*) > 100")
+  end
+
+  def self.negative_post_ids(user_id)
+    select_values_sql("select post_id from post_votes where score < 0 and user_id = ?", user_id)
+  end
+
+  def self.positive_post_ids(user_id)
+    select_values_sql("select post_id from post_votes where score > 0 and user_id = ?", user_id)
+  end
+
   def score=(x)
     if x == "up"
       Post.where(:id => post_id).update_all("score = score + #{magnitude}, up_score = up_score + #{magnitude}")