table builder: fix various incorrect css classes.

Change calling convention to explicitly indicate whether the attributes
are for the <th> element or the <td> element. Fixes various cases where
the two were mixed up.

* Fix .col-expand classes not being set correctly on the /post_versions,
  /pool_versions, and /notes pages.

* Fix .updater and .updated-at classes not being set correctly on the
  /forum_topics page.

* Fix the name param being ignored (noticeable in the post count field
  on the /tags page).

* Don't pass empty string when column has no name.

app/views/favorite_groups/index.html.erb

@@ -2,7 +2,6 @@
   <div id="a-index">
 
     <%= table_for @favorite_groups, width: "100%" do |t| %>
-      <% t.column nil, {width: "5%"} %>
       <% t.column "Name", {width: "60%"} do |favgroup| %>
         <%= link_to favgroup.pretty_name, favorite_group_path(favgroup) %>
         <% if favgroup.post_count > CurrentUser.user.per_page %>