FotoPreProcessor Revision 14

Revision 14 introduces a new preview mode. Only embedded thumbnail images as well as small images are loaded directly. Icon images can only be enlarged up to 160×120 pixels. But, after double-clicking a thumbnail, the entire selected image is loaded and displayed in place of the thumb list. Another click into the preview image lets the user return to the list view. In addition, small glitches were fixed to make FPP more robust. And Python v2 is chosen explicitly, because FPP is not yet compatible to Python v3.