Have console.log stream to UI by default

[3Nigma]

... this way, the kernel will mimic what Pyhton does with its print function which will be a more intuitive way of doing things in Jupyter.

We should code for a kernel command-line flag (eg. --log-to-term that, when present, routes console.logs to the process terminal while still allowing kernel.print to stream log to the UI).

This is the reply that triggered this discussion.