"Presentation mode" for plots

[christopherreeder]

What
Implement a flag that has the effect of increasing the size of the font in plots

Why
Plots as they are currently generated are difficult to read when put in slides for presentations.

How
Abstract the font size specification in plots.py so that each plot type is capable of generating plots with a font size appropriate for presentation-viewing or non-presentation-viewing.

Acceptance Criteria
A presentation-mode flag can be used

[ndiamant]

I think it's possible to save plots as html to make them interactive with bokeh: https://docs.bokeh.org/en/latest/docs/reference/io.html#bokeh-io-saving