Restart ĞTest with 1.3.0

We could have a special release for ĞTest binaries, which can only be plugged on ĞTest network by default. In a configuration file, for example.

Of course anyone could modify this, it is just a protection for users. If they download ĞTest release, plug them on ĞTest network. We could add "ĞTest network" in the titles of Duniter UI also.

Done. https://duniter.org/fr/g1-test-redemarree/