Add a test to exercise adding canonical reference rules and pushing new
canonical tags.
A change in `rad id` was required to allow adding a new payload to the document,
i.e. one that does not already exist.
Adding rules is also documented in the man page for `rad id`.
Allow the `rad node connect` command to use only a `NodeId` when connecting.
The `NodeId` is used to connect to known addresses, and will stop at the first
address that is connected to.
Fintan Halpenny
Lorenz Leutgeb
Johannes Kühlewindt
Lorenz Leutgeb