posts: add /posts/{id}.html?variant=tooltip template.

app/views/posts/show.html+tooltip.erb

@@ -0,0 +1,7 @@
+<%= @post.presenter.split_inline_tag_list_html(self) %>
+
+<div class="post-tooltip-metatags">
+  <%= link_to_search "user:#{@post.uploader_name}" if CurrentUser.is_moderator? %>
+  <%= link_to_search "rating:#{@post.pretty_rating.downcase}" %>
+  <%= link_to_search "score:#{@post.score}" %>
+</div>