List tab
     
    The controls of this tab are used to build the list of images and/or 
      movies :
      
        - The "+" button, or the "File->Add ..." menu, adds a movie or image 
	  file to the list.
	
- The "-" button, delete or backspace keys, delete the entry 
	  associated with the highlighted line in the list frame.
 If this entry is a movie, all its images are deleted alltogether.
- The "<<" button or the left arrow key, highlights the previous 
	  entry selected for further processing (ie: with a checkmark).
	
- The ">>" button or the right arrow key, highlights the next entry
	  selected for further processing (ie: with a checkmark).
	
- The "√" button, space or return keys, toggle the highlighted line 
	  checkbox state in the list frame.
      
When this tab is selected, the image frame displays the image associated
      with the list frame highlighted line, if any (ie: the line represents an 
      image file or a movie image).
    Align tab ...