Refactors pAI law code...

...to use the inherited laws datum instead of its own specific variables.
Most notably, this means that the Check AI Laws adminbutton will ACTUALLY show the pai laws instead of going "Durr pai's laws are null?? Contact a codurr!!"

Removes annoying double-message box when selecting NEVER FOR THIS ROUND. Multiple windows could 'stack up' and you'd have to close out of each one.
Span classes.