It's an explosion proc that uses locate to locate only turfs and then ex_acts them. As opposed to grabing every atom in a square around the epicenter and then selecting which ones to ex_act
this version also supports sticking a sleep() in there to help stop the server getting too backlogged.
git-svn-id: http://tgstation13.googlecode.com/svn/trunk@4134 316c924e-a436-60f5-8080-3fe189b3f50e
