Initial stab at making the AI plane take the user into account when flying a circuit...

Initial stab at making the AI plane take the user into account when flying a circuit.  The AI plane will now delay it's turns to the various legs if the user has flown a wider pattern that it normally would in front of it.  However, this is very much still work in progress - when the pattern gets extended the AI plane lands short of the runway, and it doesn't alter its speed around the circuit at all, only the turn positions.  Still, its a start...