changed nodeparam naming behavior

app/node/param.h

@@ -129,7 +129,7 @@ public:
   /**
    * @brief Name of this parameter to be shown to the user
    */
-  const QString& name();
+  QString name();
   void set_name(const QString& name);
 
   /**
@@ -250,6 +250,8 @@ public:
    */
   const rational& LastRequestedTime();
 
+  virtual DataType data_type() = 0;
+
 signals:
   /**
    * @brief Signal emitted when an edge is added to this parameter