Add 'status' column to vendor cost table in product view

(available vs. discontinued)

tailbone/templates/products/view.mako

@@ -196,6 +196,7 @@
           <th>Case Size</th>
           <th>Case Cost</th>
           <th>Unit Cost</th>
+          <th>Status</th>
         </thead>
         <tbody>
           % for cost in instance.costs:
@@ -206,6 +207,7 @@
                 <td class="center">${h.pretty_quantity(cost.case_size)}</td>
                 <td class="right">${'$ %0.2f' % cost.case_cost if cost.case_cost is not None else ''}</td>
                 <td class="right">${'$ %0.4f' % cost.unit_cost if cost.unit_cost is not None else ''}</td>
+                <td>${"discontinued" if cost.discontinued else "available"}</td>
               </tr>
           % endfor
         </tbody>