Log Message:
Changes 4.0:
* Partially rewritten ntop processing engine to address reliability and
  performance
* Several bugs and stability issues fixed
* Added better support for IPFIX and NetFlow v9, as well as ntop PEN
 (Private Enterprise Number)
* Added support for Cisco ASA firewalls
* Added ntop engine scriptability via the python programming language
* Added RRDalarm plugin for generating alerts based on thresholds
* Improved google maps integration
* Enhanced sFlow support