Add new app 'help' for user support

This commit adds a new model that enhances the user profile with an
offline support code, a postal address and an email address to allow
users to reset their profile.

The commit adds to Django admin commands 'populate' and
'reset_offline_code' to maintain the help user profiles from the Django
command line.

gnuviechadmin/help/admin.py

@@ -0,0 +1,22 @@
+from django.contrib import admin
+from django.contrib.auth import get_user_model
+from django.contrib.auth.admin import UserAdmin as BaseUserAdmin
+from django.utils.translation import ugettext_lazy as _
+
+from help.models import HelpUser
+
+User = get_user_model()
+
+
+class HelpUserInline(admin.StackedInline):
+    model = HelpUser
+    can_delete = False
+    readonly_fields = ("offline_account_code",)
+
+
+class UserAdmin(BaseUserAdmin):
+    inlines = (HelpUserInline,)
+
+
+admin.site.unregister(User)
+admin.site.register(User, UserAdmin)