Quick and dirty fix for design flaw in target scope implementation.

Hi Georg,

Here is a fix for the issue I mentioned by email, with an accompanying test.

I think a proper fix would require a serious redesign: to stop using (and reusing) the ScopedSettings class itself as a kind of container for the settings of a model, but use instances of a class instead.

Anyway, until then, the proposed fix should plug the leaks.


Cheers, and thanks again for your great work!

-- 
Yves-Eric