[Spambayes] Upgrade problem

[Just van Rossum]

T. Alexander Popiel wrote:

> Why don't we just store the counts, and only compute the probabilities
> when we need to reference them?  Yes, it is more efficient for bulk
> testing to only compute the probabilities once, but it's definitely
> a lose for incremental training.
> 
> Unless there's good arguments against, I'll make a patch for this
> in the next day or two.

+1 (I assume you mean implementing a chaching scheme, right?)

Just