Rebased to current master.

I don't quite see the need for pktqueue, it's just a priority_queue in disguise.

Disguise as in: it adds not more code to the memory but makes the code that uses it easier to read?

How does it achieve that?

It's a collection of inline functions (no additional code) and it does all the required casting for you (interfacing code is easier to read)

@Kijewski, do you consider this as a problem? From my side, I would give it an ACK.

I am not opposed to this code, I just don't see much merit.
But if @authmillenon finds it easier to use these wrapper functions for her use case, then ACK.

@authmillenon, merge at will.

Addressed @OlegHahm's comment and go