Attach manual processes to executor and executor processes to resource monitoring

[kzscisoft]

This fix adds the processes created via the Executor to the list of processes handled by Run in terms of resource metric gathering. It also adds the killing of any processes attached using set_pid to auto-abort. Note if the PID is the PID of the script run itself, this will not be aborted this way, but its children will be.

[james-panayis]

I'd like some tests of thus, but that can be added later