- Now remote database cleaning-up will be detected automatically.
- A solution selection dialogue will be shown if synchronisation is rejected after cleaning or rebuilding the remote database.
- During fetching or rebuilding, we can configure `Hidden file synchronisation` on the spot.
- `Fetch` and `Rebuild database` will work more safely.
- Case-sensitive renaming now works fine.
Revoked the logic which was made at #130, however, looks fine now.