bogofilter-0.13.0 available

[Clint Adams]

> Since the defaults have changed as described (because it was beneficial 
> to do so) is it recommended (or does it make sense) to move my current 
> wordlists aside and retrain to build new wordlists before I start using 
> the new build?

Other than what's been suggested already, you might consider keeping
your old lists in place, and subtracting the old counts after you have
accumulated enough new messages.  (Effectively using the old db to seed
a new one).  I may do this for 0.13.0.