Re: (PR#9610) AI movemap

<URL: http://rt.freeciv.org/Ticket/Display.html?id=9610 >

I'm using the movemap code in a redesign of the bodyguard code (see 
PR#10694).

The movemap stores for each tile a struct holding two unit lists: 
one_turn and two_turn. There is therefore repeated code, where an 
operation is performed on the one_turn list and then on the two_turn 
list. In the bodyguard code I'm writing, this repetition is particularly 
ugly.

I think it would be better to store a fixed-length array of lists, with 
the length #define-d as 2, and using loops over the array of lists 
instead of duplicating code. This would give the further benefit of 
making it a trivial change to increase the look-ahead above 2 turns.