[bug] InteractiveExecutor blocks on error in submitted functions

[pmrv]

I've set up a pyiron table with the InteractiveExecutor and ran into the issue that any error in a submitted function makes the whole executor block. When I later interrupted the kernel the backtrace showed it was waiting to join processes, so I assume the problem is that the executor tries to shutdown without informing the processes that hadn't experienced an error and are therefor still executing the other jobs.

...
tab.executor_type = 'executorlib.interactive.executor.InteractiveExecutor'
tab.server.cores = 20
...

[jan-janssen]

This should be fixed with #532