rename similar posts to recommended posts, refactor menu on posts/show

app/logical/anonymous_user.rb

@@ -281,6 +281,10 @@ class AnonymousUser
     false
   end
 
+  def enable_recommended_posts?
+    false
+  end
+
   User::Roles.reject {|r| r == :anonymous}.each do |name|
     define_method("is_#{name}?") do
       false

app/logical/post_sets/recommended.rb

@@ -1,5 +1,5 @@
 module PostSets
-  class Similar < PostSets::Post
+  class Recommended < PostSets::Post
     def initialize(post)
       super("")
       @post = post