LastInc now writes "completed" to "status-inc-backup"-file already after...

... having suceeded with tar/bz2:ing the database file. Before this change, "completed" was written to the status-file only upon a successful file transfer to the online storage. In conclusion, this change ensures that the next incremental backup (FirstInc) can be performed even though the tar.bz2-file is currently being transferred to the online storage.