[pstricks] plotstyle=line

[Alexander Michel]

In the end I was able to add the desired plotstyle somehow by copy
paste other code fragments. I called it OpenLine and added it to
pstricks.tex, pst-plot.tex and pstricks.pro. The files are attached.
Maybe a maintainer can add this plotstye in a proper way in some of
the next versions. I marked every change with "OpenLine"

Thanx

Alex
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