[pstricks] new requirement of pst-tools

[grivet]

Hello Pstricks,
During the last six or seven years, I have written many Latex/Pstricks 
programs with no special problems.
Two weeks ago, I tried to modify one such program; it compiled 
successfully. But then, I found that Yap
could not open the resulting .dvi (it froze) and, when I tried to 
generate a Postscript file, Miktek informed me that
pst-tools.pro, a part of the package pst-tools, was needed.
This piece of software was never installed on my computer and I a 
curious to know why it has suddenly
become necessary.
Thank you for your help
JP Grivet

PS: a minimal example
\documentclass[A4,12pt]{article}

\usepackage[T1]{fontenc}
\usepackage[latin9]{inputenc}
\usepackage[french]{babel}
\usepackage{pstricks}
\setlength{\oddsidemargin}{-5.4mm}
\setlength{\textwidth}{15cm}
\setlength{\topmargin}{4.6mm}
\setlength{\textheight}{22cm}
\pagestyle{empty}
\begin{document}

\begin{pspicture}(12,7)

\psline{->}(1,3)(9,3)\psline{->}(3,1)(3,6.5)
\psline[linecolor=blue,linewidth=2pt]{->}(3,3)(8.2,3)

\end{pspicture}


\end{document}