Reuse username as email if it looks like a valid email address

* Automatically add it as UnconfirmedEmail and trigger confirmation mail
* Clean up views with black

requirements.txt

@@ -2,25 +2,36 @@ autopep8
 bcrypt
 defusedxml
 Django
+django-anymail[mailgun]
 django-auth-ldap
 django-bootstrap4
 django-coverage-plugin
 django-extensions
 django-ipware
 django-user-accounts
+email-validator
 fabric
 flake8-respect-noqa
+git+https://github.com/ercpe/pydenticon5.git
+git+https://github.com/flavono123/identicon.git
 git+https://github.com/ofalk/django-openid-auth
+git+https://github.com/ofalk/monsterid.git
+git+https://github.com/ofalk/Robohash.git@devel
+mysqlclient
+notsetuptools
+pagan
 Pillow
 pip
+psycopg2-binary
 py3dns
 pydocstyle
 pyLibravatar
 pylint
 PyMySQL
-python3-openid
 python-coveralls
 python-language-server
+python-memcached
+python3-openid
 pytz
 rope
 setuptools
@@ -28,13 +39,3 @@ six
 social-auth-app-django
 wheel
 yapf
-django-anymail[mailgun]
-mysqlclient
-psycopg2-binary
-notsetuptools
-git+https://github.com/ofalk/monsterid.git
-git+https://github.com/ofalk/Robohash.git@devel
-python-memcached
-git+https://github.com/ercpe/pydenticon5.git
-git+https://github.com/flavono123/identicon.git
-pagan