[PATCH] Improve group information on USB device

[Robert Helling]

Hi,

> On 28.12.2015, at 14:05, Miika Turkia <miika.turkia at gmail.com> wrote:
> 
> As the group can be something else than dialout on some systems, mention
> this on user manual.

this patch adds the name of the group owning the device to the error message so the user does not have to look it up herself.

I tested this on Mac, I hope it compiles (and works) on the other OSes.

Best
Robert

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