Workout Editor Notify Plots when ErgFile Upated

.. so other plots see changes we made (without saving).

.. the reason we don't insist on saving the erg file is
   because we often increase intensity or repeat sections
   just for a one off run.

src/WorkoutWidget.cpp

@@ -105,10 +105,15 @@ WorkoutWidget::start()
 
     // if we have edited the erg we need to update the in-memory points
     if (ergFile && stack.count()) {
+
+        // replace all the points
         ergFile->Points.clear();
         foreach(WWPoint *p, points_) {
             ergFile->Points.append(ErgFilePoint(p->x * 1000, p->y, p->y));
         }
+
+        // force any other plots to take the changes
+        context->notifyErgFileSelected(ergFile);
     }
 
     // clear previous data