Include date hierarchy in quick removal links (#218)

* Include date hierarchy in quick removal links

* use date field name in removal link

* reduce diff

* tweak some details

* start adding tests

* use mock without spec :(

it's not easy to instantiate ChangeList, and speccing from
the class means that many attributes are not recognized

* more tests

* more tests

* more checks for generated URLs

* better tags and tests

* compat for tox 4

admin_interface/templates/admin_interface/date_hierarchy_removal_link.html

@@ -0,0 +1,3 @@
+<div class="changelist-filter-clear"><a href="{{ removal_link }}">
+  {{ date_label|capfirst }}: <span>{{ date_value|date:date_format|capfirst }}</span>&nbsp;&#10006;
+</a></div>

admin_interface/templates/admin_interface/list_filter_removal_link.html

@@ -1,6 +1,5 @@
-{% load admin_interface_tags %}
 {% if spec.lookup_val or spec.value %}
-  <div class="changelist-filter-clear"><a href="{% admin_interface_clear_filter_qs cl spec %}">
-    {{ title|capfirst }}: <span>{{ selected_value }}</span> &#10006;
+  <div class="changelist-filter-clear"><a href="{{ removal_link }}">
+    {{ title|capfirst }}: <span>{{ selected_value }}</span>&nbsp;&#10006;
   </a></div>
 {% endif %}