Rotation and image processing
- Add rotation transformation for Öland
- Page middle is important when the scan is off-center. For example DAWSONIA_DEBUG=1 dawsonia label -c cfg/dawsonia.toml -f 193 -l 193 -m 1380 ../../../data/ai-for-obs/raw/ÖLAND/DAGBOOK_Öland_Station_Jan-Dec_1927.pdf