Note: never used flent before.

I played around with it locally using the gui. Seems to work fine, although for e.g. the `bursts1 test I get

19:54:27 ERROR: Runner Ping (ms) UDP EF failed check: No netperf binary found in PATH.

But I guess it's better to rely on netperf on the path instead of adding all tools for all tests (don't know how many there are) as a dependency

Yep, I had not added the dependencies when I created the package as I was only looking for the gui aspect of it, but that should probably be changed. @teto took a stab at wrapping flent, though #41521 I'm not quite sure what the ultimate goal was though.

let's provide a full version by default then. Pass an extraPrograms ? [ ] parameter and from all-packages.nix pass the required 3rd party programs: iperf/netperf etc.
It's not like these are huge programs anyway. Would be good to see the change in closure size though.

@teto sgtm, but in a follow up PR?

waiting for the follow up commit then, let's build with everything but let the possibility for someone to srip it down, sthg like extraDeps ? [ netperf iperf ... ]

sgtm, will do so in next few days.