[m-rev.] for post-commit review: fix mantis bug 361

[Zoltan Somogyi]

On Tue, 16 Sep 2014 05:52:29 +0200 (CEST), "Zoltan Somogyi" <zoltan.somogyi at runbox.com> wrote:
> About 360: the feature is not compatible with our current
> implementation. The attached DIFF is a proposal for documenting
> the restriction.

I am committing that diff. Any further changes can be done
after our discussion about grades is finished.

Zoltan.