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* Improve log level documentationRobin Krahl2018-05-22
| | | | | | Now, the documentation clearly states the purpose of each log level. Also, the documentation for set_log_level is corrected: libnitrokey always prints to stderr.
* Restructure code by functionalityRobin Krahl2018-05-22
In future versions, we want to support not only the Nitrokey Pro, but also the Nitrokey Storage. This requires a better code layout. This patch introduces two main changes: First, the OTP-specific methods are moved from the Device trait and the AdminAuthenticatedDevice struct to the functionality-based traits ConfigureOtp and GenerateOtp. This will hopefully make it easier to integrate the Nitrokey Storage. Secondly, the code is split into separate modules. These modules are currently all private and re-exported in the lib module, but we can consider making them public in the future.