Add a mode to "interleave" stdout and stderr #313
Description
ATM we write both stdout and stderr into different files.
I would like to be able to switch to another mode, which would dump them into the same file, so ideally mimicing how humans see it dumped to the terminal. Ideally we might want to annotate somehow which stream it is e.g.
[stdout] output to stdout
[stderr] output to stderr
may be there is already a separate helper which could help us with that and push everything to stdout with annotations (not just 2>&1) and we could just turn off e.g. stderr output, and overall just an example/howto?