[2375] Move dumps_url variables into package controller

This might not be the place for it but it's better than having it in
the template.

ckan/controllers/package.py

@@ -173,6 +173,10 @@ def pager_url(q=None, page=None):
 
         c.search_url_params = urlencode(_encode_params(params_nopage))
 
+        # Extracted from package/search.html template.
+        c.dumps_url = config.get('ckan.dumps_url')
+        c.dumps_format = config.get('ckan.dumps_format', '')
+
         try:
             c.fields = []
             search_extras = {}