simulation.py: return complex s parameter value when dB == False

[laberge1]

I updated the s_param function in the Simulation class to allow it to pass complex values. When "dB" is False, instead of taking the absolute value of "s" and returning it, it just returns the complex value. This is helpful is phase information is desired.

I also ran "black --line-length 79 simulation.py" on the modified file. It does look like that compressed the unused documentation strings in each function onto a single line.

[matthuszagh]

Hm, I can't figure out why black is doing that for you. It doesn't for me, and if I change a docstring to be all one line (i.e., """"""), it doesn't change that either. My version's a bit old (19.10b0), so maybe that's it. What version are you using? In any event, sorry to keep sending you back for changes, but if you could just get rid of the docstring changes then we should be good to go.

[laberge1]

No worries! Thank you for letting me contribute.

I am using version 20.8b1. In looking through issues, it appears that this one may have resulted in the issues that we are seeing.