Initial add of On This Day links to svx file page

templates/svxfile.html

@@ -80,6 +80,17 @@ LOGMESSAGES
     -->
 {% endif %}
 </div>
-
-
+<span style="font-family: monospace;  font-size: 130%; ">
+{% for sb in svxblocks %}
+<details {% if forloop.first %} open{% endif %}><summary><b>{{sb.date|date:"Y-m-d"}}</b> {{sb.title}} '{{sb.name}}'</summary>
+List of Logbook entries, wallets and other survex files on {{sb.date|date:"Y-m-d"}}.
+<br />
+[Work in progress, Feb. 2023...]<br />
+    {% include 'onthisdate.html' %}
+</details>
+{% empty %} 
+Cannot find any survex blocks in this survex file. <br />
+Report this to a nerd if you think this is incorrect.
+{% endfor %}
+</span>
 {% endblock %}