BUGFIX: race2 mission didn't handle the new core systems properly.
On hard mode, the race mission is failed if any outfits are installed.  This included core systems.  It now
requires that only the manufacturer standard core outfits are installed.
Additionally, the AI racers created by addRaw() had two sets of core systems: the base ones and the slightly
better ones added for most craft.  That will need to be fixed as well, but for this mission, I just removed
all systems and installed only the basic core systems.