Initial check-in of original rsnapshot 1.398
rsnapshot does not create the interval.0(for the lowest interval, e. g. hourly.0) directory any more
because the rotation is pulled out of rsnapshot and is done by zfs now. So the backups reside in only
the given hostdirectories set in rsnapshot.conf
Added zfsbackup.

zfsbackup is a wrapper shellscript, that manages Snapshot. After my first try
in which I directly renamed zfs-snapshot, i got the problems, that zfs wrote the
messages. Snapshot X Busy.

Thatswhy I switched from renaming snapshots to creating snapshots with timestamps
and creating symlinks pointing to the snapshots.