Delete script created
Squashed commits:
[817e014] Fixed compact
[7191c35] Added output and compacting.
[97f19ba] Added user specification of keeping last n snapshots (+1 squashed commit)
Squashed commits:
[59fca28] Delete snapshot script started.
Created single prepare script that calls create snapshot and delete snapshot scripts.  Also compacts vdi.
Added compact script
Moved compact out of prepare and added logging