- Replace changes from 8c7371c5d4
- Removed debugging prints in skybox generation
- Reverted change to GetConnnectedZLevels to avoid the chicken-or-egg initialization issue of find_z_levels() requiring knowledge of a sector's z-levels during the attempt to determine a sector's z-levels.
- Make find_z_levels() always called again so that lazy open space initialization works on landable ships again.
- Instead, allow static configuration of sector map_z to override the default behavior of calling GetConnectedZLevels()
07d483203d