2023-10-10: initial release
2023-10-16: added options  --keep-max  and --min-age 
2023-10-17: removed -p, -c, -d (use the long options instead: --path-in-inventory, --data-source, --inventory-columns)
            changed option --keep-max to --keep
            added option --check-user-data-only
            added SEED_DEVICES to user data, option -s/--sed-devices is now optional
            refactoring