Use 6 decimal places on postcode HTML page.

No idea why the latitude in the wmflabs link was being limited to
1 decimal place previously!

mapit/templates/mapit/postcode.html

@@ -13,7 +13,7 @@ <h2>{{ postcode.postcode }}</h2>
         E/N: {{ postcode.easting }}, {{ postcode.northing }}
       {% endif %}
       {% if postcode.wgs84_lat or postcode.wgs84_lon %}
-        <li>{% trans "WGS84 lat/lon" %}: <a href="https://tools.wmflabs.org/geohack/geohack.php?params={{ postcode.wgs84_lat|floatformat }};{{ postcode.wgs84_lon }}">{{ postcode.wgs84_lat }}, {{ postcode.wgs84_lon }}</a>
+        <li>{% trans "WGS84 lat/lon" %}: <a href="https://tools.wmflabs.org/geohack/geohack.php?params={{ postcode.wgs84_lat|floatformat:-6 }};{{ postcode.wgs84_lon|floatformat:-6 }}">{{ postcode.wgs84_lat|floatformat:-6 }}, {{ postcode.wgs84_lon|floatformat:-6 }}</a>
       {% else %}
         <li>{% blocktrans trimmed %}
     No location information. Note this <em>is</em> a valid postcode (otherwise you would have got a 404), just one for which we don&rsquo;t know the location.
@@ -36,7 +36,7 @@ <h2>{{ postcode.postcode }}</h2>
         maxZoom: 18
     });
 
-    var point = new L.LatLng({{ postcode.wgs84_lat }}, {{ postcode.wgs84_lon }});
+    var point = new L.LatLng({{ postcode.wgs84_lat|floatformat:-6 }}, {{ postcode.wgs84_lon|floatformat:-6 }});
     var marker = new L.Marker(point);
     map.addLayer(marker);
     map.setView(point, 14);