Processing Front-End for the PID Library

About the only thing I'm not seeing (that I'd maybe expect to see) would be a display of the current scales on the axes. But hey, I'm nit-picking!

no worries about "nit-picking". I did ask for feedback after all ;). I think that's a really good point . it'd also probably be a good idea have some corresponding grid lines. my first new feature for v0.2!

Brett