Related to #383 Remember Last Tunnel

Remembers the last tunnel in a local .dot file.
All newly opened ssh sessions (assuming that are our tunnels) will
be killed.
You Shall Not Kill -9
Output PIDs of the Tunnels
Verify Process ID is a SSH Process
More Careful PID Killing

- just kill the one special listening tunnel
- avoid killing other ssh tunnels
- the basic tunnel to port 22 will persist for now
  (since this one does not block anything)
- just one remaining file for PID storage necessary
Add More Output as Comments
Add further COMMENT= comments :)
Merge pull request #397 from ax3l/topic-moreParaviewScript

Related to #383 Remember Last Tunnel