[#368] Groups do not support reading them as of a certain date. So le…

…t's not link to it in the revisions table.

ckan/templates/group/snippets/revisions_table.html

@@ -21,7 +21,7 @@
           {% link_for rev.id | truncate(6), controller='revision', action='read', id=rev.id %}
         </td>
         <td class="dataset-details">
-          <a href="{{ h.url_for(controller='group', action='read',id='%s@%s' % (group_dict.name, rev.timestamp))}}" title="{{_('Read group as of %s') % rev.timestamp }}">{{ h.render_datetime(rev.timestamp, with_hours=True) }}</a>
+          {{ h.render_datetime(rev.timestamp, with_hours=True) }}
         </td>
         <td class="dataset-details">{{ h.linked_user(rev.author) }}</td>
         <td class="dataset-details">{{ rev.message }}</td>