* 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

app/models/post.rb

@@ -777,6 +777,7 @@ class Post < ActiveRecord::Base
         update_column(:is_deleted, true)
         update_column(:is_pending, false)
         update_column(:is_flagged, false)
+        update_column(:is_banned, true) if options[:ban]
         give_favorites_to_parent
         update_children_on_destroy
         update_parent_on_destroy