Where possible, put the #include in the .cc file instead of the header
file.
Include <ostream> when <iostream> is not needed.
Fix a bug in operator<<() for Measurement: NULL value of ap and mobile
was not checked.
- Adding WifiDevice and Mobile. AccessPoint and Mobile are sub-classes
of WifiDevice.
- Measurement: link to Mobile and AccessPoint.
- Adding CalibrationMeasurement.
- ReferencePoint: add_measurement() and operators, link to
CalibrationMeasurement (not Measurement).
- Area and Waypoint : using pointers (not references) for attribute
setting.
- Deleted class ClientInfo (replaced by Mobile).
Matteo Cypriani