Trying to fix MString assignments.

MString.h

@@ -94,9 +94,11 @@ namespace coreutils
       ///
       /// Assignment operator will copy data to backing store.
       ///
-            
+
       MString &operator=(coreutils::MString data);
-      MString &operator=(coreutils::ZString data);
+      MString &operator=(coreutils::ZString value);
+
+      MString &operator=(std::string value);
 
       ///
       /// Assignment operator will copy data to backing store.