Show error message if running an old version of the program with a ne…

…w config file

skychart/pu_main.pas

@@ -6678,6 +6678,16 @@ procedure Tf_main.ReadDefault;
 begin
   ReadPrivateConfig(configfile);
   ReadChartConfig(configfile, True, True, def_cfgplot, def_cfgsc);
+  if config_version > cdcver then begin
+    if MessageDlg('Wrong version','You are trying to run Skychart version '+cdcver+
+               ' but the configuration file '+Configfile+' is for a more recent version '+Config_Version+crlf+
+               'Please use the program options --config= and --userdir= to select another configuration '+
+               'if you realy want to do that.'+crlf+
+               'Ignoring this error can break your setup!'
+               ,mtError,[mbAbort,mbIgnore],0)
+       = mrAbort
+       then halt;
+  end;
   if config_version < cdcver then
     UpdateConfig;
 end;