Gnuplot/C Update

A new version of Gnuplot/C has been uploaded to SourceForge that includes polar plotting capabiliites : https://sourceforge.net/projects/gnuplotc/.

This adds to the existing plot types :
    Line Plot
    XY Plot
    Pole-Zero Plot
    Spectrogram Plot
    Image Plot

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Numerix-DSP Libraries : http://www.numerix-dsp.com/eval/