Trying to fix MString assignments.

File.h

@@ -16,7 +16,7 @@ namespace coreutils {
    class File {
 
     public:
-      File(std::string fileName, int mode = O_RDONLY, int authority = 0664);
+      File(std::string fileName, int mode, int authority);
       File(ZString &fileName, int mode = O_RDONLY, int authority = 0664);
       ~File();
       void setBufferSize(size_t size);