Gilles Peskine 831ac72338 Add transaction file and driver storage; new key file format
Update the storage architecture with the new features introduced for
secure element support:

* Lifetime field in key files.
* Slot number in key files for keys in a secure element.
* Transaction file (name and format).
* Persistent storage for secure element drivers (name and format).

The version number is not determined yet.
2019-07-23 19:32:21 +02:00
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