[m-rev.] for review: report an error for multiple modes of operation

[Zoltan Somogyi]

On Sun, 30 Aug 2015 15:42:43 +1000 (AEST), Julien Fischer <jfischer at opturion.com> wrote:
> The '--help' and
> '--version' options are not included in this set and still take precedence over
> any other command line options.

I can understand why you left out --help; you don't want to put
unnecessary obstacles before people who want help. But what was
your reason for leaving out --version? The information it prints
is very similar to the information printed by several of the op modes.
(I don't much care one way or the other; I am just curious.)

The diff is fine. Thanks.

Zoltan.