more minor cleanup

[clarkedavida]

• [x] get rid of the func_sup_numpy stuff that remains in the fitter... it's better to just enforce everyone plays nice with numpy. makes the code much easier to read, and forces the programmer to vectorize.
• [x] finally my vscode is once again pointing out unused imports, so it would make sense to go through the code and clean that up.

[clarkedavida]

the block

    # Options for plotting files and functions.
    'xcol': None,        # Column for the xdata when plotting a file.
    'ycol': None,        # Column for the ydata when plotting a file.
    'yecol': None,       # Column for the errors in y-direction when plotting a file.
    'xecol': None,       # Column for the errors in x-direction when plotting a file.
    'style': "dots",     # Style when plotting a file.
    'npoints': 1000,     # Number of points for function plotting.

in the plotting library's default_params probably shouldn't be there. especially the column stuff... you should specify that when you call the function that plots the data.

[clarkedavida]

done