rnd-20131113-1-src

* fixed problem with R'n'D restarting with same level set that may have
  caused a problem (and therefore failing again and again); after an
  error, the last level set is now deactivated in file "levelsetup.conf"
  to restart with default level set (which should work without error)
* fixed determining main game data directory on Mac OS X "Mavericks"
* version number set to 3.3.1.2