Figures in the manual



Hi,
I would like to add some figures to the Maxima manual. They
would only appear in the HTML and PDF versions, while the info
version would not suffer any changes (using @ifnotinfo @image...).

You can see the result in:
  http://fisica.fe.up.pt/pub/maxima/doc/5.9.2.19cvs/maxima_8.html

and on sections 8 and 63 (starting from pages 79 and 583) of the
PDF manual:
  http://fisica.fe.up.pt/pub/maxima/doc/5.9.2.19cvs/maxima.pdf

You can also see how it would look in the Portuguese version:
   http://fisica.fe.up.pt/pub/maxima/doc/5.9.2.19cvs/pt/maxima_8.html
   http://fisica.fe.up.pt/pub/maxima/doc/5.9.2.19cvs/pt/maxima.pdf
and for the Spanish version I could do something similar.

To commit those changes, I would have to create a directory, for
instance doc/info/screenshots, that would currently take 1.6 MBytes
for 58 PNG and PDF files.

Please let me know what you think.

Cheers,
Jaime