enhancing list of wallets on cave description page

templates/cave.html

@@ -121,8 +121,15 @@ Nope, it is not useful, removing it... Philip S.
     <a href="{% url 'caveQMs' cave_id|safe %}">QM page for {{ cave_id|safe }}</a> 
 {% endif %}
 
-  <h2>Scanned survey notes</h2>
-  <a href="{% url "cavewallets" cave_id %}">{{ cave_id|safe }}</a> (if any)
+  {% if wallets %}
+    <h2>Wallets: scanned survey notes</h2>
+
+    There are <a href="{% url "cavewallets" cave_id %}">{{wallets|length}} wallets</a>   with data for this cave:<br />
+    {% for w in wallets %}
+
+     <a href="{{w.get_url}}">{{w.walletname}}</a> 
+    {% endfor %}
+  {% endif %}
 {% endif %}
  
 {% if cave.notes %}

templates/cavewallets.html

@@ -20,11 +20,16 @@ traced to produce Tunnel or Therion drawings and eventually the final complete c
 {% for otherexpedition in expeditions %}
   | <a <a href="/wallets/year/{{ otherexpedition.year }}">{{otherexpedition.year}}</a>
 {% endfor %}</ul></ul>
+
 {% include 'wallet_table.html' %}
+
 <p>Note that names in italics are copied from the related survex file block name.
 <br />
 <p>Total underground survey length: {{length_ug|floatformat:"1g"}} m<br />
-Note that this is for <em>all the wallets</em> listed above, which includes those which may not be directly relevant to what you are looking for.
+Note that this is for <em>all the wallets</em> listed above, which includes those which are surveys of different caves not just {{cave}}.
+<br />
+If you want accurate cave lengths for {{cave}}, go to the <a href="/survexfile/{{cave.survex_file}}">primary survex file</a> for this cave 
+and click on the "Run 'cavern' on this SVX file" button at the bottom of the page.
 <br />
 <table width=95%>
 <tr><th>Wallet</th><th width=13%>Wallet Date</th><th>Wallet Name</th><th width=25%>People</th><th>Scans</th><th>Survex blocks</th><th>Drawings using these scans</th></tr>