mtav

This would fix #219 when using c.NativeAuthenticator.import_from_firstuse = True: When importing users from passwords.dbm, the hashed password was processed as if it was a cleartext password, leading the original password...

import_from_firstuse not working: Previous users cannot log in or create an account.

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### Bug description After setting _c.NativeAuthenticator.import_from_firstuse = True_ and reloading the configuration, the users from _firstuse_dbm_path_ do get added to the new database, but they cannot log in or create...

requirements.txt + installation guide added.

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Added requirements.txt and an installation guide to help people use these notebooks after the end of the challenge.