refs #720, file name handling in models

* normalize file name before writing to DB
* use local file paths for local models
* display "C" for color liveries

src/blackmisc/simulation/aircraftmodellist.h

@@ -192,6 +192,9 @@ namespace BlackMisc
             //! From given CDistributorList update the model`s distributor order
             int updateDistributorOrder(const CDistributorList &distributors);
 
+            //! File name normalized for DB
+            void normalizeFileNamesForDb();
+
             //! Completer strings
             QStringList toCompleterStrings(bool sorted = true) const;