Fixed assignment of double to MString.

MString.h

@@ -81,6 +81,12 @@ namespace coreutils {
       ///
       
       MString(std::FILE *file);
+
+      ///
+      ///
+      ///
+
+      MString(double value);
       
       ///
       ///
@@ -117,6 +123,12 @@ namespace coreutils {
       
       MString &operator=(char data);
       
+      ///
+      /// Assignment operator for saving a double value..
+      ///
+      
+      MString &operator=(double value);
+      
       ///
       ///
       ///