* Various improvements to tracing & diagnostics.
- Manage possibility of `Account` not having code for `PodAccount`
- New RPC: `trace_sendRawTransaction`
- See raw transaction dump when inspecting over RPC
* Fix test
* Remove one of the dupe error messages
* Remove unneeded `&`s
* Reformat and extremely minor optimisation
* Minor optimisation
* Remove unneeded let
* Fix tests.
* Additional fix.
* Minor rename.
[ci:skip]
* Bowing to the pressure.