Add reference / user login property.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@4239 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/PropertySheet/Person.py

@@ -35,6 +35,11 @@ class Person:
 
   _properties = (
     # Personnal properties
+    { 'id'         : 'reference'
+    , 'description': 'Also know as user login.'
+    , 'type'       : 'string'
+    , 'mode'       : 'w'
+    },
     { 'id'         : 'password'
     , 'description': ''
     , 'type'       : 'string'