Make 'stal' a string option.

pentadactyl/NEWS

@@ -102,7 +102,7 @@
         a boolean.
       - 'mapleader' is now an option rather than a :let
         variable.
-      - 'showstatuslinks' is now a string option.
+      - 'showstatuslinks' and 'showtabline' are now string options.
     * IMPORTANT: Command script files now use the *.penta file extension.
     * IMPORTANT: Plugins are now loaded from the 'plugins/'
       directory in 'runtimepath' rather than 'plugin/'.

pentadactyl/content/config.js

@@ -6,7 +6,7 @@
 // given in the LICENSE.txt file included with this file.
 "use strict";
 
-const Config = Module("config", ConfigBase, {
+var Config = Module("config", ConfigBase, {
     name: "pentadactyl",
     appName: "Pentadactyl",
     idName: "PENTADACTYL",
@@ -174,7 +174,7 @@ const Config = Module("config", ConfigBase, {
     defaults: {
         complete: "slf",
         guioptions: "bCrs",
-        showtabline: 2,
+        showtabline: "always",
         titlestring: "Pentadactyl"
     },