Slowpoke101/FTBLaunch — pull request #484 by bolte-17 (2012-12-20 04:58:16+00:00)
Title: Minor bug will prevent multiple private packs

String.concat does not change the string it's called on (immutable!), so
only the first element (codes[0]) would get passed to setProperty.

Clarified AddPrivatePacks as well. It seemed like the previous change
only caught empty-string packs, not duplicates.