colobot/colobot — pull request #190 by xiendev (2013-04-27 15:21:26+00:00)
Title: Added "build (category)" instruction for ingame scripting

Third patch, disabled building of towers and nuclear plants if they are not researched yet
![build](https://f.cloud.github.com/assets/2929789/434551/fae97e2a-af4d-11e2-9903-59ad169e83d9.png)