To run gnuplot xycontour tests.
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The gnuplot command in ngspice is:
gnuplot <file> xycontour <expr>
xycontour is a new flag. Only a single <expr> is allowed to be plotted
in a contour diagram. With <expr1> vs <expr2> only <expr1> is plotted.
ngspice passq.cir
This plots xy contour diagrams for 2d Cider save file data.
On visualc Windows in a cmd shell, run 'winq.cir'.
ngspice passq1.cir
This checks that gnuplot <file> xycontour <expr> works with 1d data.
The xycontour flag is just ignored.
On visualc Windows in a cmd shell, run 'winq1.cir'.
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