ChangeLog for libGPS
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2007/08/07	Processed some GPSExceptions like UnsupportedComOperationException
			or file not found.

2007/08/07	GPSPrefsDialog parameters are processed when pushing ok, not before

2007/08/01	Fixed some NMEA exceptions in GPSNmeaDataProcessor and GPSManager

2007/07/31	Connection button from MainWindow is disabled while connecting

			GPSManager is now defined as a singleton, it is never instantiated
			but can accessed with GPSManager.getGPSManager from any class
			
			libGPS now uses log4j instead of Debugger

2007/07/06  GPSSatDlg shows now relevant data about satellite signal strength
            and position
            
            GPSDataDlg shows now out of date data in different colour

2007/07/02: Added GPSFix class, a structure containing all relevant GPS fix data
            with a timestamp associated to each data field

            Changed some property names in GPSDataProcessor, which were already
            different from the original sources of gpstool, including
            FIX_QUALITY, FIX_SATELLITES and FIX_DIMENSION