Animate

• If the ``save as pixmaps'' button is ON, the ``nb. pixmaps'' (number of pixmaps) is updated.
• If ``cyclic animation'' and ``step mode'' button are OFF, clicking on the left and right arrows make the image be drawn in decrease or growth.
• If ``cyclic animation'' is ON, the images are drawn according to the left or right arrows, and loop.
  Press again the toggle button to stop.
• If ``step mode'' is ON, the next image is drawn as you press the left or right arrow, step by step.
• To destroy the current animation, press ``destroy pixmaps'' . The servor memory will be cleared with the animation images.
  The buttons in ``animate'' panel become insensitive.