[patch] 3D curve parametric plot



Hi.

It used to be possible to do 3D parametric curve plots with

 plot3d([sin(t), cos(t), t], [t,-5,5], [y,-5,5], [grid,100,2],
  [gnuplot_pm3d,false])$

but in the current version it gives

 plot3d: wrong number of variables: [t]. There should be two

The problem can be fixed with the attached patch. It would be nice if
it were committed to the mainline. It is also a good idea to document
the grid trick in plot3d documentation.

-- 
Regards,
ASK
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