Add functions to disable hosts when false is returned by "is_correct()"
Add functions to remove hosts loop in parents
Add functions to set a default name to hosts that doesn't have host_name
Add a test in test_remove_twins in order to try a name conflict and fix tests which use an invalid command
Modify the test which determine if a command "is_valid"
Add a test to check the replacement of illegals characters in the host_name attribut