fix issue #689: Wind Direction (azimuth angle) has been added to the set of...

fix issue #689: Wind Direction (azimuth angle) has been added to the set of data provided by the weather station method inside the system. The corresponding RAL command 'wx' wil provided the same parameter as well. Specifically (#690)

temperature, humidity, pressure, wind speed and wind direction. Is a parameter is not avaiable a -1 is returned