Fixed an issue with map generation getting stuck
Fixed an issue with map generation getting stuck

If Tantegel was placed on a very small island, the map generation would get
  stuck trying to find a place to put Charlock. Added an extra check for
  walkable land size before placing Charlock to avoid this.

mcgrew/dwrandomizer,mcgrew/dwrandomizer,mcgrew/dwrandomizer,mcgrew/dwrandomizer,mcgrew/dwrandomizer