misc: install django-replace-migrations to squash migrations (#40685)

It can rewrite/squash existing migrations using :

  tox -e manage -- makemigrations --name replace --replace-all `find -iname migrations -type d | sed 's#.*/\([^/]\+\)/migrations#\1#'`

setup.py

@@ -191,6 +191,7 @@ setup(
         'zxcvbn',
         'phonenumbers',
         'publik_django_templatetags@git+https://git.entrouvert.org/publik-django-templatetags.git',
+        'django-replace-migrations',
     ],
     zip_safe=False,
     classifiers=[

src/authentic2/settings.py

@@ -169,6 +169,7 @@ INSTALLED_APPS = (
     'xstatic.pkg.jquery_ui',
     'xstatic.pkg.select2',
     'django.forms',
+    'django_replace_migrations',
 )
 
 # authentication