Colored postscript graphics in imaxima mode

Hello,

Colored surfaces in embedded graphics (wxdraw and wxdraw3d) in emacs + 
imaxima are always rendered in gray levels, since the current palette is 
ignored. The second image in this site is an example:

http://sites.google.com/site/imaximaimath/tutorial-of-imaxima/tutorial-of-imaxima-inline-graph




If in the definition of function $wxdraw (imaxima.lisp), we substitute

((mequal simp) $terminal $eps)

by

((mequal simp) $terminal $eps_color)

something like

wxdraw3d(
         enhanced3d = [x-z/10,x,y,z],
         palette    = [3,6,-16],
         explicit(20*exp(-x^2-y^2)-10,x,-3,3,y,-3,3))$


should plot a colored surface. See screenshot:

http://riotorto.users.sourceforge.net/gnuplot/func3d/emacs_color.png

I'm an occasional user of emacs and I don't know if there is any special 
reason for using the eps terminal instead of eps_color. If not, I can 
commit this change.

--
Mario