ginput script for new gnuplot

At the new web page for forthcoming gnuplot 4.0 release, in section "Links"
=> "Programming interfaces - bidirectional interaction":

    http://gnuplot.sourceforge.net/links.html

I have put a testing example "gpReadMouseTest-m.zip": Bidirectional
communication for getting mouse coordinates using mkfifo and gnuplot's "set
print" command, version for Octave.

Somebody(TM) is welcome to turn this into a ginput.m script -- please
contribute. I think this would be "cleaner" implementation than the current
octave-forge version of ginput.

Thanks,
   Petr Mikulik