Bugs:
    - fping - some ICMP messages are written on console
    - nmap - some messages are written on console
    - ping in debian woody/stable doesn't support -w option

Todo:
    - OSPF line generation
    - email notification in case of some node's failure
    - add ability to generate more picture (different parameters)
      from one state file without need to ping it more times
    - change structure of .config file
