<URL: http://bugs.freeciv.org/Ticket/Display.html?id=34422 >
I planned to implement this in some point anyway, but now I even got
an request for it.
Currently "AttackAny" unit can attack any "Unreachable" units.
However, if reasons for unreachability differ between units, it makes
no sense that same unit can work as killer for all of them.
For example: there might be units that are "Unreachable" because they
fly and others that are "Unreachable" because they burrow. It makes no
sense that Fighter can attack both types and is the only unit that can
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