[#714] Use score not relevance in default sort order

'relevance' is not actually in the solr schema so it doesn't do
anything, score is the one we want.

ckan/logic/action/get.py

@@ -1235,7 +1235,7 @@ def package_search(context, data_dict):
     abort = data_dict.get('abort_search',False)
 
     if data_dict.get('sort') in (None, 'rank'):
-        data_dict['sort'] = 'relevance asc, metadata_modified desc'
+        data_dict['sort'] = 'score desc, metadata_created desc'
 
     results = []
     if not abort:

ckan/templates/snippets/sort_by.html

@@ -11,7 +11,7 @@
 <span class="form-select control-group control-order-by">
   <label for="field-order-by">{{ _('Order by') }}</label>
   <select id="field-order-by" name="sort">
-    <option value="relevance asc, metadata_modified desc"{% if sort =='relevance asc, metadata_modified desc' %} selected="selected"{% endif %}>{{ _('Relevance') }}</option>
+    <option value="score desc, metadata_modified desc"{% if sort =='score desc, metadata_modified desc' %} selected="selected"{% endif %}>{{ _('Relevance') }}</option>
     <option value="title_string asc"{% if sort=='title_string asc' %} selected="selected"{% endif %}>{{ _('Name Ascending') }}</option>
     <option value="title_string desc"{% if sort=='title_string desc' %} selected="selected"{% endif %}>{{ _('Name Descending') }}</option>
     <option value="metadata_modified desc"{% if sort=='metadata_modified desc' %} selected="selected"{% endif %}>{{ _('Last Modified') }}</option>