Better error messages or avoid them altogether

[richiejp]

Tracker issue for augmenting or eliminating the many unintelligible errors that get spat out by lower layers of the stack.

• libp2p connection failure due to invalid address: "produced zero addresses"

[richiejp]

I've started to remove the code that hides error messages and replaces them with a trace ID. It was far too inconvenient.

This has security implications, because error messages may reveal a misconfigured server.