In this implementation, the `TZ` environment variable must be set
in order for the formatted output to use a more user-friendly
time zone abbreviation (e.g., `UTC`). Otherwise, the output uses
the time zone's UTC offset (e.g., `+00:00`).

Mobile push isn't currently supported, but this should get rid of spurious
`Detected unexpected parameter during login: devicepushtoken` warnings.

- Added security check for previouse used codes
- Allow TOTP codes with 1 step back and forward when there is a time
drift. This means in total 3 codes could be valid. But only newer codes
then the previouse used codes are excepted after that.

Send new device email after two factor authentication.

TODO:
- At the moment each user needs to configure a DUO application and input the API keys, we need to check if multiple users can register with the same keys correctly and if so we could implement a global setting.
- Sometimes the Duo frame doesn't load correctly, but canceling, reloading the page and logging in again seems to fix it for me.

Added newlines to config options to keep them a reasonable length.

Improved some two factor methods.

In the future, maybe we can do the same with the `find_by_id` methods that return an Option.

Improved error logging, now it won't show a generic error message in some situations.
Removed delete device, which is not needed as it will be overwritten later.
Logged more info when an error occurs saving a device.
Added orgmanager to JWT claims.