bug#21817: Extraneous argument to guix gc is ignored

[Berntsen, Petter]

Hi guys,

Running a command like "guix gc help", the "help" argument is ignored 
and the command proceeds like just "guix gc" was run.

I would have preferred if it would have stopped and complained instead 
whenever something is unclear. What do you think?

(I assume this happens with other guix commands as well, not just gc.)

Thanks,
Petter
(karhunguixi)