Killing jobs cleanly
MPI jobs will hang for a variety of reasons or not
behave the way they should e.g take too long or
give absurd results…
In such cases they should be terminated.
This should be done in such a way as to ensure
a clean environment for subsequent jobs.
Scali MPI:
  scakill  -f nodes  -s qcd
Dangers: in Scali all jobs matching the given
string are killed!