- add field for add user
- in the `pwg.users.add` method, the params `send_password_by_mail` does nothing anymore. Because we no longer want to send passwords in clear text.
- in the `pwg.users.add` add a new `auto_password` parameter to generate a random password when a user is created
- use this parameter (`auto_password`) in user_list.js
- change mail content et password page on first login
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