Provide useful options in commandline interface

Registered by Jean-Peer Lorenz

Main functionality should be available through proper commandline interface. Useful commandline options are:
* force a full backup
* force an incremental backup (needs definition of behavior in case of errors, i.e. no incr. backup possible)

Blueprint information

Status:
Not started
Approver:
None
Priority:
Undefined
Drafter:
None
Direction:
Needs approval
Assignee:
None
Definition:
Approved
Series goal:
None
Implementation:
Unknown
Milestone target:
None

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