add customer field to osusers.models.User

- allow association of os users to Django users (customers)
- adapt admin forms
- add migration

gnuviechadmin/osusers/admin.py

@@ -38,7 +38,7 @@ class UserCreationForm(forms.ModelForm):
 
     class Meta:
         model = User
-        fields = []
+        fields = ['customer']
 
     def clean_password2(self):
         """
@@ -57,6 +57,7 @@ class UserCreationForm(forms.ModelForm):
 
         """
         user = User.objects.create_user(
+            customer=self.cleaned_data['customer'],
             password=self.cleaned_data['password1'], commit=commit)
         return user
 
@@ -75,7 +76,7 @@ class UserAdmin(admin.ModelAdmin):
     add_fieldsets = (
         (None, {
             'classes': ('wide',),
-            'fields': ('password1', 'password2')}),
+            'fields': ('customer', 'password1', 'password2')}),
     )
 
     def get_form(self, request, obj=None, **kwargs):