RCD disabler, Machine Overload, Blackout, and ReCam modules now properly stack uses when purchased multiple times.
It is no longer possible to buy multiple uses of one-time modules like Fireproofing, Turret upgrade, and CentComm Report Hack.
Fixed an inaccuracy in the purchasing list (large modules were listed as needing 55 cycles, they only remove 50)
git-svn-id: http://tgstation13.googlecode.com/svn/trunk@536 316c924e-a436-60f5-8080-3fe189b3f50e