Make tests quieter

* Transition::Import was quite noisy, printing as it did to `$stderr` a lot
* Add a global `#active=` to allow printing of messages to null console
* Remove unused option to print anywhere else but `$stderr`
* Add `#console_puts` and `#console_prints` to route these messages through
* extend class-method using import classes to use these. Don't use
  any raw `puts`/`print`