Feature request: Distance attacking enemies

```
Player can do distance attacks, when the ships attacks from the heavy weapons
range. The enemy always closes up for battle, even if they could shot the
player from distance. I think the A.I. could use this distance attacking tact
in battles.
```

Original issue reported on code.google.com by `kli...@gmail.com` on 18 Jan 2014 at 6:45