Implement DELETE for jobsets and use it in the web interface

src/root/edit-jobset.tt

@@ -133,18 +133,6 @@
 
     <div class="form-actions">
       <button type="submit" class="btn btn-primary"><i class="icon-ok icon-white"></i> [%IF create %]Create[% ELSE %]Apply changes[% END %]</button>
-
-      [% IF !create %]
-        <button id="delete-jobset" type="submit" class="btn btn-danger" name="submit" value="delete">
-          <i class="icon-trash icon-white"></i>
-          Delete this jobset
-        </button>
-        <script type="text/javascript">
-          $("#delete-jobset").click(function() {
-            return confirm("Are you sure you want to delete this jobset?");
-          });
-        </script>
-      [% END %]
     </div>
 
   </fieldset>