* All users can now view deleted posts.

* Posts now have an is_banned flag for artist removal requests.  Basic users can not view banned posts but gold and higher can.
* Banning an artist both deletes the post and bans it.
* By default deleted posts are not filtered out of post searches at the sql level.

app/models/artist.rb

@@ -173,7 +173,7 @@ class Artist < ActiveRecord::Base
             rescue PostFlag::Error
               # swallow
             end
-            post.delete!
+            post.delete!(:ban => true)
           end
         rescue Post::SearchError
           # swallow