exposing thread tools to users in the "administrators" set, fixing up

Topics methods to call the "editable" method first instead of just
checking rep thresholds.

Also changed the limit on thread length from 10 to infinity (for now,
until infinite scrolling makes it in)

src/user.js

@@ -264,7 +264,7 @@ var config = require('../config.js'),
 
 		User.exists(username, function(exists) {
 			RDB.incr('global:next_user_id', function(err, uid) {
-				RDB.handle(err);
+				RDB.handfle(err);
 
 				var gravatar = User.createGravatarURLFromEmail(email);
 
@@ -524,7 +524,13 @@ var config = require('../config.js'),
 
 	User.isModerator = function(uid, cid, callback) {
 		RDB.sismember('cid:' + cid + ':moderators', uid, function(err, exists) {
-			callback(exists);
+			callback(!!exists);
+		});
+	}
+
+	User.isAdministrator = function(uid, callback) {
+		RDB.sismember('administrators', uid, function(err, exists) {
+			callback(!!exists);
 		});
 	}