Added support for MString in File

MString.cpp

@@ -56,7 +56,7 @@ namespace coreutils {
 
    MString::~MString() {
       if(data)
-	free(data);
+        free(data);
    }
 
    // MString& MString::operator=(coreutils::ZString& value) {
@@ -77,12 +77,12 @@ namespace coreutils {
    //    return *this;
    // }
 
-   MString& MString::operator=(coreutils::ZString value) {
-      if(*this == value)
-     	  return *this;
-      int len = length;
-      setSize(length + value.getLength());
-      memcpy(data + len, value.getData(), value.getLength());
+   MString& MString::operator=(coreutils::ZString &value) {
+//      if(*this == value)
+//     	  return *this;
+      setSize(value.getLength());
+      memcpy(data, value.getData(), value.getLength());
+      length = value.getLength();
       return *this;
    }