refs #250, formatting, minor tweaks and fixes

* changed return type for updateFromVatsimDataFileStation
* improved resolution for own aircraft
* convenience method findFirstByCallsign
* automatically convert frequency to MHz for ATC station
* improved output in toQString
* GUI, flight plan formatting
* corrected logging for network context
* override keyword in listmodelbase

src/blackmisc/avcallsignlist.h

@@ -25,27 +25,19 @@ namespace BlackMisc
         class CCallsignList : public CSequence<CCallsign>
         {
         public:
-            /*!
-             * \brief Default constructor.
-             */
+            //! Default constructor.
             CCallsignList();
 
-            /*!
-             * \brief Construct from a base class object.
-             */
+            //! Construct from a base class object.
             CCallsignList(const CSequence<CCallsign> &other);
 
-            /*!
-             * \copydoc CValueObject::toQVariant()
-             */
+            //! CValueObject::toQVariant()
             virtual QVariant toQVariant() const
             {
                 return QVariant::fromValue(*this);
             }
 
-            /*!
-             * \brief Register metadata
-             */
+            //! Register metadata
             static void registerMetadata();
 
         };