Fix: Radar detection. Special case.

If UFO detected by conventional radar, need check other bases, maybe they has hyper-wave decoder.
Some optimizations.

The situation:
![screen082x50](https://f.cloud.github.com/assets/3616568/1389700/762e3388-3bde-11e3-8deb-664394192f9f.png)

Issue: Hyper-wave not works until UFO remains in area of conventional radar coverage.
![screen083x50](https://f.cloud.github.com/assets/3616568/1389727/0f675908-3bdf-11e3-86b6-e83fb41aa063.png)