Fix to make access of canbus frames const correct. It's now not really possible to modify the captured canbus frames from outside the model class that holds them. This is safer and more future proof.

Boring update but it might save head scratching in the future.

graphingwindow.h

@@ -29,7 +29,7 @@ class GraphingWindow : public QDialog
     Q_OBJECT
 
 public:
-    explicit GraphingWindow(QVector<CANFrame> *, QWidget *parent = 0);
+    explicit GraphingWindow(const QVector<CANFrame> *, QWidget *parent = 0);
     ~GraphingWindow();
     void showEvent(QShowEvent*);
 
@@ -53,7 +53,7 @@ private slots:
 private:
     Ui::GraphingWindow *ui;
     QList<CANFrame> frameCache;
-    QVector<CANFrame> *modelFrames;
+    const QVector<CANFrame> *modelFrames;
     QList<GraphParams> graphParams;
     QPen selectedPen;
     bool needScaleSetup; //do we need to set x,y graphing extents?s