Tracing is broken

[hyperthunk]

Tracing for named send, unreliable send, and monitoring appears to be either missing or has been stripped out accidentally in previous commits. I'll look at putting this back in.

[facundominguez]

Not sure if it is meant to be fixed here.

Tracing received messages currently produces a loop, which I hope to fix here.
It is not very elegant but it should work while something better is implemented.

I will make a PR after I write some tests.

[hyperthunk]

That code makes sense, as does the bug. Silly mistake on my part.. Thanks for the spot, and fix!

[hyperthunk]

I'm just starting to cook up a PR for this..

[hyperthunk]

I am working on proving the things that we're saying in #241