Ks plots without divergence lines have inner legend

[Cecilia-Sensalari]

When the adjustment table is not available (yet), the output figure only shows the paralog Ks distribution without divergence lines. The legend is now placed inside the axis instead of outside. This is done for the "normal" mixed plot, for the anchor cluster plot, for the exp-log plot and for the log-only plot.

[lohausr]

I have posted the changed code to remove the right margin in the comments to fc_plotting.py.

[Cecilia-Sensalari]

• matplotlib >= 3.3.3 for correct positioning of simple plot suptitle
• removed the line of code that I used to reduce the y-axis height because v3.3.3 fixes this issue

[lohausr]

Looks good to me now!