Routing seeing some updates coming as well
+- Profile the bandwidth of nodes joining the network. Reject slow nodes.
+- Organise nodes into disjoint sections. Introduce the
+- Maintain lists of signatures of neighbouring sections, which will enable
+ secure message validation.
+- Accumulate messages in the sending group/section, then send the messages with
+ all the signatures across a single route. This reduces the number of total
+ invididual hop messages that need to be sent.
+- Routes are now disjoint: Retrying to send a message along a different route
+ cannot potentially fail on the same node again.
+- Merge the routing_table crate into routing.
+- Remove the internal event handling thread. Events should be handled in the
+ upper library's event loop. That way, some message passing can be replaced by
+ direct calls to routing methods.
+- Remove the
PlainData type which was only used in tests.