* functionnalities

- add a travel comcept of sprite : that is sprite that evolve thru a
  slide rather than jus come from left top bottom or right.

- Add a way of producing postscript of slides

- add a notion of library of sprite (autoload-able, and browsable) 

- add a gif sprite chooser with a library.

- Add a font chooser.

- Add a color chooser.

* Documentation

- finalize documentation of SlideShow as a presentation.

- add latex documentation when finalized

- add  doc on ltx2gif.

- reread and refresh sources

- add more example

* Improvement

Make it work even if X11:Protocol is not available

  
 
