change the gafor id to an integer

aman/config/Airport.py

@@ -219,7 +219,7 @@ class Airport:
         if None == dataConfig.get('gaforid'):
             sys.stderr.write('No GAFOR-ID found!')
             sys.exit(-1)
-        self.GaforId = dataConfig['gaforid']
+        self.GaforId = int(dataConfig['gaforid'])
 
         # get the default sequencing data
         self.parseDefaultSequencingConfiguration(icao, planningConfig)