Legacy files

The aio-files replace the obsolete el-files used for hourly energy data and also the obs-files containing hourly weather observation data with temperature, wind speed and global radiation. The fc-files replace the obsolete wp0, wp1 and wp2-files that could only store up to 100 forecast blocks. The cl-files will replace the kli-files that are currently used for storing climate weather with the parameters temperature, wind speed and global radiation.