[Windows] pgnuplot.exe not recognized

[GuillaumeSutra]

On Windows, when I run the learning on mnist:
./n2d2 "mnist24_16c4s2_24c5s2_150_10.ini" -learn 600000 -log 10000
I get many non-fatal errors in console output:
'pgnuplot.exe' is not recognized as an internal or external command

Indeed the folder gnuplot/bin contains wgnuplot.exe and gnuplot.exe but no pgnuplot.exe.

Can you fix it in file Gnuplot.cpp ?

#ifdef WIN32
        mCmdPipe = _popen("pgnuplot.exe", "w");
#else
        mCmdPipe = popen("gnuplot", "w");
#endif

[olivierbichler-cea]

pgnuplot.exe was needed in old versions of gnuplot, but has been deprecated since at least gnuplot 4.5 and removed entirely in gnuplot 5.0.
gnuplot 4.5 was introduced in 2012... the gnuplot.exe command is here for some time already, so it doesn't seem necessary to maintain backward compatibility with pgnuplot.exe.