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Until now, all initial values (including implicit ones) written in the initial state when converting to protobuf.
This is problematic as it means the problem reconstructed after export and importing to protobuf was not strictly equivalent: some implicit values were made explicit in process.
A bad consequence is that it made protobuf conversions much more expensive that it had too (even after the optimization of #559, 90% of the time spend remains in the initial state generation in at least some non trivial problems).
This PR only save to protobuf the explicitly set initial values. The defaults values of the fluent were already there.