done for the day 9/15/14

Worked on how images where displayed.  Changed onPaint being called more
than necessary.  Added a way to changed the update speed for the GUI -
CallLater(...).  For some reason, when resizing the preview panel,
onSize is called fairly regularly.  However, the behavior changed when I
move the sash between MyListCtrl and the preview panel, it updates
differently... Time I guess.