Extended traceback mode

[maxfischer2781]

Debugging interaction with actual resources (e.g. MatterMiners/tardis#87) requires more information than what standard tracebacks provide. An extended traceback including values would help.

Traceback should be similar to pytest and/or what we had in other projects (see HPDA, somewhere in GridControl that I cannot find). In addition to the call chain, show a repr of the locals/self variables.

Since this can be version dependent, it should be an optional flag to the daemon.

[rcaspart]

For reference, in grid-control the corresponding part is the hpfwk package, specifically the file hpf_debug.py.