Revision 709

Use XMLReader and XMLWriter.
(GetProjFiles): Renamed from GetProjections. Now returns a list
        of ProjFile objects.
(GetSystemProjFiles): Renamed from GetSuppliedProjections. Returns
        a list of ProjFile objects whose files are not user defined.
(GetUserProjFiles): Renamed from GetUserProjections. Returns a
        list of ProjFile objects whose files are user defined.
(ProjFileReader): Extend new XMLReader.