fix: sub_div_center calculation, + update skumsjøen centers

server/database/icedb-journal

server/main.py

server/map_handler/__pycache__/add_lake.cpython-311.pyc

server/map_handler/__pycache__/add_new_lake.cpython-311.pyc

.../map_handler/__pycache__/get_measurements.cpython-311.pyc

server/map_handler/add_new_lake.py

server/map_handler/get_measurements.py

server/map_handler/lake_relations/all_lake_names.json

server/map_handler/lake_relations/skumsjøen_centers.txt

server/map_handler/lake_relations/skumsjøen_div.json