re-binding to another argument doesn't work

[Ichthyostega]

a conceptual error causes re-binding of a command (e.g. to another target object) to break.

[Ichthyostega]

...actually I thought I might get away with a very cheap (in terms of dev time) solution and later on implement it cleanly and without heap allocation. But seemingly I need to do at least part of the work immediately :-/

[Ichthyostega]

(In #148) test is written (and expected behaviour is defined), but still waiting for a preliminary impl. of the registry

[Ichthyostega]

seemingly the key to the solution is not to store a closed functor (thereby overwriting the original functor), but instead to hook into the function invocation operator and use our own CommandClosure object instead of relying on the boost::bind implementation. Details might get a bit more involved, but looks like the better design anyway, so let's just do it...

[Ichthyostega]

broken logic is fixed now...
caused some refactorings, which actually simplified the implementation :)

pending final test (see #148)

[Undercover Agent]

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