The original square box did not look like anything, by using an image that
looks like a small window it is more clear to users what it represents.
The image was drawn as an XPM keeping a style consistent with everything
else; it was then converted to TIFF using ImageMagick:
convert -depth 8 -compress lzw xpm/smallwindow.xpm tiff/smallwindow.tiff
Signed-off-by: Christophe CURIS <christophe.curis@free.fr>
