Changes

Implement 'allow'

Tests still don't pass as I've now made use of a feature I
initially thought wouldn't exist a few months ago. Oh well,
argument capture will be a bit interesting to implement, but
would make implementing `@Local` and `@Share` easier.
I just have to do it correctly the second time I hope.
But in the worst case there is always enough time for a refractor,
even if I don't like doing them after a certain point in time.
 (commit: 6e23def)