[#3022] Use alternative_url on facet_list when genereating URLs

This allows dataset type pages to show their own facets and have links
pointing to the right direction.

ckan/templates/snippets/facet_list.html

@@ -25,13 +25,18 @@
 extras
   Extra info passed into the add/remove params to make the url
 
+alternative_url
+  URL to use when building the necessary URLs, instead of the default
+  ones returned by url_for. Useful eg for dataset types.
+
+
 #}
 {% with items = items or h.get_facet_items_dict(name) %}
   <section class="module module-narrow module-shallow">
     <h2 class="module-heading">
       <i class="icon-medium icon-filter"></i>
       {{ title or h.get_facet_title(name) }}
-      <a href="{{ h.remove_url_param(name, extras=extras) }}" class="action">{{ _('Clear All') }}</a>
+      <a href="{{ h.remove_url_param(name, extras=extras, alternative_url=alternative_url) }}" class="action">{{ _('Clear All') }}</a>
     </h2>
     {% if items %}
       <nav>
@@ -50,9 +55,9 @@ <h2 class="module-heading">
       </nav>
       <p class="module-footer">
         {% if h.get_param_int('_%s_limit' % name) %}
-          <a href="{{ h.remove_url_param('_%s_limit' % name, replace=0, extras=extras) }}" class="read-more">{{ _('Show More {facet}').format(facet=h.get_facet_title(name)) }}</a>
+          <a href="{{ h.remove_url_param('_%s_limit' % name, replace=0, extras=extras, alternative_url=alternative_url) }}" class="read-more">{{ _('Show More {facet}').format(facet=h.get_facet_title(name)) }}</a>
         {% else %}
-          <a href="{{ h.remove_url_param('_%s_limit' % name, extras=extras) }}" class="read-more">{{ _('Show Only Popular {facet}').format(facet=h.get_facet_title(name)) }}</a>
+          <a href="{{ h.remove_url_param('_%s_limit' % name, extras=extras, alternative_url=alternative_url) }}" class="read-more">{{ _('Show Only Popular {facet}').format(facet=h.get_facet_title(name)) }}</a>
         {% endif %}
       </p>
     {% else %}