Changes of Simple Parallel Exec from #4 to #5

29: - initialisation: for every slave: try to start client (ssh).

30: If it fails: check ssh connection with dummy ssh command. Success -> copy client to slave using scp and try to start it.

31: - initialisation: for every slave: try to start client (ssh). If it fails: check ssh connection with dummy ssh command. Success -> copy client to slave using scp and try to start it.