Add messages to the current job’s history

This mocks out a data structure for a job’s messages, and renders this data:
- on the notification page, as a table, which links through to…
- …the page for an indidivual message

app/templates/components/table.html

@@ -32,8 +32,12 @@
   </table>
 {%- endmacro %}
 
-{% macro field(first=False, wide=False, action=False) -%}
-  <td class="table-field{% if first %}-first{% endif %}{% if first and wide %}-wider{% endif %}{% if action %}-with-action{% endif %}">
-    <span>{{ caller() }}</span>
+{% macro field(align='left', status='') -%}
+  <td class="table-field{% if align == 'right' %}-right-aligned{% endif %}">
+    <span class="{{ 'table-field-status-' + status if status }}">{{ caller() }}</span>
   </td>
 {%- endmacro %}
+
+{% macro right_aligned_field_heading(text) %}
+  <span class="table-field-heading-right-aligned">{{ text }}</span>
+{%- endmacro %}