New --new-nid storage option for fast cloning
It is often faster to set up replicas by stopping a node (and any underlying database server like MariaDB) and do a raw copy of the database (e.g. with rsync). So far, it required to stop the whole cluster and use tools like 'mysql' or sqlite3' to edit: - the 'pt' table in databases, - the 'config.nid' values of the new nodes. With this new option, if you already have 1 replica, you can set up new replicas with such fast raw copy, and without interruption of service. Obviously, this implies less redundancy during the operation.
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