[pstricks] patch : autoscale y axis for psgraph

[Martin Chicoine]

I changed lines 2047 and 2072 of the \psgraph definition in pstricks.tex to
:

 

\ifdim#6=0cm\pst at dima=\pst at tempA\pst at dimo\else\pst at dima=#6\fi\relax

 

and 

 

\ifdim#8=0cm\pst at dima=\pst at tempA\pst at dimo\else\pst at dima=#8\fi\relax

 

, respectively.

 

This allows to autoscale yLength (so that the scale of the x- and y-axis are
the same) if the user enters yLength=0cm.

 

It may not be the best way to do this but it works!

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