Hi,

xl command options are currently handled in each command's sub function, 
leading to a lot of duplicate code.
This patch moves the common part of it into a separate function,
which handles the help switch, unknown options and an insufficient
number of parameters. This removes a lot of redundant code.

Due to the high number of commands this patch is rather large. If that 
would help reviewers, I could split it up, though this would be rather 
artificial. Just tell me.


Signed-off-by: Andre Przywara <andre.przywara@amd.com>

Regards,
Andre.

-- 
Andre Przywara
AMD-Operating System Research Center (OSRC), Dresden, Germany