Transition from helpers for constructing condition messages

[simonpcouch]

log_problems(), tune_log(), siren(), message_wrap(), and format_msg() currently take care of stateless (i.e. no machinery keeping track of previously seen conditions) logging in tune. We should:

1. clarify the difference between log_problems() and tune_log(),
2. ensure that all conditions are routed through the right one, and
3. write out message_wrap() and format_msg() in favor of cli's width and newline tooling