v0.7.1

Cynitor v0.7.1

Passing an interface that does not exist used to exit with a Python
traceback, taking the dashboard down with it. Also if there are
no CAN interfaces at all, it prints the commands to create a
virtual one instead.

The auth token is shown at startup

Generating a token with $(openssl rand -hex 24) is now printed once:

  Auth token (paste this into the dashboard when prompted):

  a3f9c2e1b8d470563a...

It is written straight to the terminal rather than logged, so it stays out of
/api/logs, the dashboard's log panel, and the system journal. Runs without
a terminal, which is every supervised run, print nothing.

The startup banner no longer contradicts itself

A direct-mode start printed both Mode: direct (attached to ... at startup)
and Selection-mode startup (no --can) four lines apart. The condition was
inverted.