AA Bug

Game Number 9 766 873

Bug Description: we were trying out the new AA to see how it worked. This is reproducible:

- if there is a lone AA, as soon as a plane starts a patrol within its circle it fires (which it what it should do).

- If the plane moves to a new spot or a new plane comes in, it doesn't fire, which seems to indicate a cooldown timer but that does not appear like it would for artillery. There is no visible timer on the screen, however. I'm not sure if that's a bug or intentional

- the certain bug happens if the AA is stacked with arty. It doesn't fire automatically on enemy patrol like it does when it's alone.