Plot data using matplotlib instead of Gnuplot about modesolverpy

[jtambasco]

Hi,

Yes, that error is probably due to you not having Gnuplot (or not having it setup properly in PATH).

In any case, I've added some code that should check if Gnuplot is in PATH; if it's not, matplotlib will be used (if it exists). So you should now get all your plots rendered with matplotlib if you use the latest version.

The library also outputs data files, so you could also just plot them however you want yourself.

Let me know if you find any bugs/issues with the matplotlib code I added.