Add email field to Account

As suggested in code review, many libraries expect the Django user
account to have an email field.  The AbstractUser implementation even
provides a method to get the name of the field that contains the user's
email address.

NAV currently has no need for emails attached directly to user objects,
so this field is just being added for the sake of compatibility.  It
may slip into usage at a later stage.

Author: lunkwill42

python/nav/models/profiles.py

@@ -88,6 +88,7 @@ class Account(AbstractBaseUser):
     """NAV's basic account model"""
 
     USERNAME_FIELD = 'login'
+    EMAIL_FIELD = 'email'
     DEFAULT_ACCOUNT = 0
     ADMIN_ACCOUNT = 1
 
@@ -105,6 +106,7 @@ class Account(AbstractBaseUser):
 
     login = VarcharField(unique=True)
     name = VarcharField()
+    email = models.EmailField(null=True, blank=True)  # Not currently used by NAV
     password = VarcharField()
     ext_sync = VarcharField(blank=True)
     preferences = HStoreField(default=dict)

python/nav/models/sql/changes/sc.05.14.0101.sql

@@ -0,0 +1,2 @@
+-- Add email column to account table just to be more compatible with Django user models
+ALTER TABLE account ADD COLUMN email VARCHAR(254) DEFAULT NULL;