[freeciv-ai] Flying AI v5

[Gregory Berkolaiko <Gregory.Berkolaiko@xxxxxxxxxxxx>]

This is an updated version of AI-can-fly series.

Most of Mike's comments were addressed in some way, functions declared 
static whenever possible.

Per, can you check for compiler warnings that you said you had earlier, 
please.

I think it is ready for inclusion, but it will be modified when the 
path-finding is agreed upon: the queue will be separated into common.

I feel it's a bit premature to do it now, because the structure of the 
queue interface needed for PF is not finalised.

Another thing: I am not convinced that having planes acutually makes AI 
harder; while planes are very effective, they are costly too.  AI makes 
great use of them to fence off incoming transports, and they are good to 
kill a city's defenders, but being stupid, AI doesn't capitalise on it and 
doesn't always occupy the city.

So, placement of H_NOPLANES handicap can be discussed (currently easy AI 
doesn't build planes).

I believe this to be a minor issue though.

G.

ai_can_fly_v5.diff.gz
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