Markeen - Regeneration passes fixed

Last time, I was very pleased with the quality improvements from the smart fill order. After looking harder at the images with the regeneration passes done, though, I realized that they didn't seem any better or worse than the ones with no extra passes. Looking at the code, sure enough, when I disabled the rare structure generator, I accidentally caused every spot to be flagged as failed.

Once I fixed that, the process ran much faster, and produced some pretty nice levels.

These were generated by a 2-deep profile with a maximum of 4 passes.