suppress_display, fig.show(), and plt.show()

[Jellevanderwerff]

In an interactive environment, the plotting functions work as expected, where they are shown when calling e.g. Sequence.plot_sequence(), and not shown when calling Sequence.plot_sequence(suppress_display=True). The problem is that in a non-interactive environment one needs to explicitly call plt.show() in order to see the plot, and also suppress_display does not seem to be working.