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/migrations/0001_add_help_user_model_extension.py

@@ -0,0 +1,55 @@
+# Generated by Django 3.2.18 on 2023-04-16 09:32
+
+import django.db.models.deletion
+from django.conf import settings
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    initial = True
+
+    dependencies = [
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name="HelpUser",
+            fields=[
+                (
+                    "id",
+                    models.BigAutoField(
+                        auto_created=True,
+                        primary_key=True,
+                        serialize=False,
+                        verbose_name="ID",
+                    ),
+                ),
+                (
+                    "email_address",
+                    models.EmailField(
+                        help_text="Contact email address", max_length=254
+                    ),
+                ),
+                (
+                    "postal_address",
+                    models.TextField(blank=True, help_text="Contact postal address"),
+                ),
+                (
+                    "offline_account_code",
+                    models.CharField(
+                        default="",
+                        help_text="Offline account reset code",
+                        max_length=36,
+                    ),
+                ),
+                (
+                    "user",
+                    models.OneToOneField(
+                        on_delete=django.db.models.deletion.CASCADE,
+                        to=settings.AUTH_USER_MODEL,
+                    ),
+                ),
+            ],
+        ),
+    ]