enhance show or new wpages; move wpage preview code to helper

app/views/wiki_pages/show_or_new.html.erb

@@ -7,12 +7,17 @@
       <div id="wiki-page-body" class="prose">
         <p>This wiki page does not exist. <%= link_to "Create new wiki page", new_wiki_page_path(:wiki_page => {:title => params[:title]}) %>.</p>
       </div>
+
+      <%= wiki_page_alias_and_implication_list(@wiki_page)%>
+
+      <%= wiki_page_post_previews(@wiki_page) %>
+
     </section>
   </div>
 </div>
 
+<%= render "secondary_links" %>
+
 <% content_for(:page_title) do %>
   Wiki - <%= params[:title] %> - <%= Danbooru.config.app_name %>
 <% end %>
-
-<%= render "secondary_links" %>