Scale

[efrecon]

Implement something similar to docker-compose scale. Such a feature would allow to create virtual machines quickly to meet the demand, while keeping the YAML file as the main description of the (types of) machines composing the cluster.

Note that this would be a breaking change as we would have to introduce automatic numbering of the machines (or similar). We could still hide part of the machine at the command line by picking the machine called xxx-1 by default or whenever there is only one.