Fix to TacAI Decoys

[Ironhawk]

Nah, minimum group size is not the way to go. It might seem good on the face of it, but it breaks down. Think about mixing up unit types - how could you possibly even guess what the min group size for it would be?

Arralen is right that the correct fix is to repair the targetting ai. Archers need to look at how much of thier volley in each turn is "wasted". So like 20 archers firing at 1 militia results in massive waste. But 20 archers firing at 50 militia will mean that probably every single arrow will hit and perhaps kill a unit.

This said tho: whether or not any changes are made to the targetting AI, there will always be loopholes if the algorithm is static.