shapes.stack: added the possibility to read .stk and .slm files
shapes.stack: added the possibility to read .stk and .slm files

.. thanks to the tiffread2 script from Francoi Nedelec.
Signed-off-by: Jean-Yves Tinevez <17c1793fcc6179ec3ae6319887e209161427f317@gmail.com>

tinevez/jyt-matlab,tinevez/jyt-matlab,tinevez/jyt-matlab,tinevez/jyt-matlab,tinevez/jyt-matlab