--Got still images into dsci viewer.  Need to work on binding 'test image get' function to a recurring keystroke a la http://www.doctort.org/adam/nerd-notes/x11-fake-keypress-event.html
--Worked out graceful exit and restart for threads so that viewer can be called again in scheme without quitting and restarting dsci.
--Fixed bug in Get_Image_from_ImgArray() that would cause a crash if called before there were images in ImgArray.  Now shows just a gray rectangle.  Could create a rectangle with text saying 'waiting on camera' or something like that.