pkgs/profpatsch/nman: let nix tools inherit stderr handle

This relieves us of the burden to print the error message and lets the
user see what's going on, for example why they have to wait for years
when running `nman duplicity` (we have to fetch all transitive python
dependencies). We also print the exit status in case of errors and
the signal that killed a process (in the case of SIGKILL, SIGSEGV and
maybe more?).

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