Trying to fix MString assignments.

MString.cpp

@@ -81,13 +81,20 @@ namespace coreutils {
       return *this;
    }
 
-   MString &MString::operator=(coreutils::ZString value) {
-      setSize(value.getLength());
-      memcpy(data, value.getData(), value.getLength());
-      length = value.getLength();
-      return *this;
+  MString &MString::operator=(coreutils::ZString value) {
+     setSize(value.getLength());
+     memcpy(data, value.getData(), value.getLength());
+     length = value.getLength();
+     return *this;
+  }
+
+   MString &MString::operator=(std::string value) {
+     setSize(value.length());
+     memcpy(data, value.c_str(), value.length());
+     length = value.length();
+     return *this;
    }
-   
+
    MString &MString::operator=(const char *value) {
       int len = strlen(value);
       setSize(len);