Bring back debug logging.

[isaacovercast]

This was useful, and was blanked in v.0.9. The -d flag literally was doing nothing for the CLI except making it so you had to run the failed command twice in order to get the stack trace, so I removed it. We should bring back the logging, imho.

[isaacovercast]

I mean, I guess I haven't really needed it in more than a year, so...... Still it seemed like it was useful at one point, but now I just tell people to send me their data and figure it out from that. Infinitely long debug logs aren't that useful it seems....