Removes recursive explosions

Once upon a time errorage tried out doing a rewrite for explosions. 

The premise seemed pretty cool, walls / rwalls / doors would block explosions differently instead of it just being a big circle.

So he coded it, and it got to the point where it was tested on the server. Once. 

It was tested only once because there was this guy named Tobba, and he was a chemist that round. He made the largest nitroglycerin grenade he could and threw it in the hallway. 

This being at the time that nitro grenades weren't bombcapped, while everything else was. 

So, the station suddenly disappeared because the code was made and balanced around the bombcap. And that was the last time that the code was used on any server, so errorage gave up since it wouldn't be used again anyway.