--User changes

-Double clicking on width or height spinner resizes both, but scales to the one double clicked.

--Bug fixes
 -Show grid setting was not being preserved during program run, only on close.
 -Zooming with the mouse wheel was broken for images whose size is greater than the screen area.

Source/Fractorium/FractoriumToolbar.cpp

@@ -154,6 +154,7 @@ void Fractorium::OnActionDrawImage(bool checked)
 /// <param name="checked">Check state, show grid if true, else hide.</param>
 void Fractorium::OnActionDrawGrid(bool checked)
 {
+	m_Settings->ShowGrid(checked);
 	ui.GLDisplay->update();
 }