Refrain from logging formatting chars in s///.

They interfere with the regex and can also accumulate.
Merge branch 'substitute-log-nobold'

* substitute-log-nobold:
  Refrain from logging formatting chars in s///.
h4x: Truncate IRC commands at 512 characters.

Rudimentary flood control until the more sophisticated stuff can be
done.
Merge branch 'truncate-512'

* truncate-512:
  h4x: Truncate IRC commands at 512 characters.
Build incremented: 0.0.49 => 0.0.50.
h4x: Dirty tree. Replace max with min?
Add dont_know auto-response (elias' suggestion).
Build incremented: 0.0.50 => 0.0.51.
h4x: Pass %opts on in Bambot::Strings::get_string.
h4x: Hard-coded mileage calculations.
Build incremented: 0.0.51 => 0.0.52.