whole file, all steps are saved to disk; we were only marking the
active steps. This sequence would cause steps to be wrongly deleted:
1: create easy and medium steps for one steps type; save
2: on another steps type, edit easy steps which were autogenned from the above
change the steps
3: f6 to change to medium steps steps which were autogenned from the above
4: menu -> save
This will save all data, but only medium will be marked saved to disk.
5: f5 to change back to easy steps
6: menu -> exit
This will delete the easy steps, because they were not marked saved to disk.