corrige search_name() qui n'est pas idempotente comme les autres méthodes search

zoo/zoo_nanterre/utils.py

@@ -230,6 +230,8 @@ class PersonSearch(object):
 
     def search_name(self, first_name=None, last_name=None, factor=1.0, first_name_weight=1.0,
                     last_name_weight=1.0):
+        self = copy.deepcopy(self)
+
         q = Q()
         if not first_name or not last_name:
             factor *= 0.8