0.3.0.1: Fix handling if single file is given. Single didn't have the same format as the rest as it was checked if the file is there in path and should it be opened first.
Major rework in case of resizing pictures. The window get a fixed size and pictures are resized to fit into it. Scaled down the zoom steps
Get zoom_percent on actual window size.
Change retrieval of initial window size. Avoid odd pixel sizes. Default to 800x600.