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Subscribers and publishers can connect to any node in the network. A message
published at any node will be routed to all subscribers regardless of which node
they are subscribed to.

Node types:

• subscribe nodes: subscribers send a specially formatted message with a wildcard
• subscription-status nodes: inform other nodes of local subscriptions.
• deal with loops and multiple routes in the network.
• publish nodes: route only to interested neighbours.

It would be nice to make the routing dynamic, so e.g. we can kill one container
and messages will be automatically redirected via another path.

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Note this queue does not guarantee ordered delivery of messages like a normal
queue. It will do "mostly ordered" delievery, the degree of disorder will depend
on the amount of re-routing that has to be done.

Constraints

• don't lose any work items.
• don't process the same item twice
• try to balance work across all containers.

Node types:

• publish: publishers send messages here.
• distributed status: so containers know where to route work items.
• subscription: consumers send special message to subscribe.