441dc41715
executing the fgcommand loadxml implicitely untied every previously tied property if a property type was given in the property element. That made it impossible to autosave aircraft data for tied properties. This patch should fix this. It adds an inconsitency, though: if a property with a given type is read in which has been tied to before and the property types do not match, the property type in the xml file will be ignored.
[ Nothing here at this time. ]