store pinned topics in new zset

keep pinned topics on top on different sort types

src/topics.js

@@ -53,23 +53,8 @@ var social = require('./social');
 	};
 
 	Topics.getTidPage = function (tid, uid, callback) {
-		if(!tid) {
-			return callback(new Error('[[error:invalid-tid]]'));
-		}
-
-		async.parallel({
-			index: function (next) {
-				categories.getTopicIndex(tid, next);
-			},
-			settings: function (next) {
-				user.getSettings(uid, next);
-			}
-		}, function (err, results) {
-			if (err) {
-				return callback(err);
-			}
-			callback(null, Math.ceil((results.index + 1) / results.settings.topicsPerPage));
-		});
+		console.warn('[Topics.getTidPage] deprecated!');
+		callback(null, 1);
 	};
 
 	Topics.getTopicsFromSet = function (set, uid, start, stop, callback) {