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/management/commands/populate.py

@@ -0,0 +1,17 @@
+from django.contrib.auth import get_user_model
+from django.core.management import BaseCommand
+
+from help.models import HelpUser
+
+User = get_user_model()
+
+
+class Command(BaseCommand):
+    help = "Populate help user information for existing users"
+
+    def handle(self, *args, **options):
+        for user in User.objects.filter(helpuser=None):
+            help_user = HelpUser.objects.create(user_id=user.id, email_address=user.email)
+            help_user.generate_offline_account_code()
+            help_user.save()
+            self.stdout.write(f"created offline account code {help_user.offline_account_code} for {user}.")

gnuviechadmin/help/management/commands/reset_offline_code.py

@@ -0,0 +1,29 @@
+from django.contrib.auth import get_user_model
+from django.core.management import BaseCommand, CommandError
+
+from help.models import HelpUser
+
+User = get_user_model()
+
+
+class Command(BaseCommand):
+    help = "Reset offline account reset code for existing users"
+
+    def add_arguments(self, parser):
+        parser.add_argument("users", nargs='+', type=str)
+
+    def handle(self, *args, **options):
+        for name in options["users"]:
+            try:
+                user = User.objects.get(username=name)
+            except User.DoesNotExist:
+                raise CommandError(f'User {name} does not exist')
+
+            help_user = user.helpuser
+            if help_user is None:
+                help_user = HelpUser.objects.create(email_address=user.email)
+
+            help_user.generate_offline_account_code()
+            help_user.save()
+
+            self.stdout.write(f"generated new offline account reset code {help_user.offline_account_code} for {name}")