Custom-built EPS icons in branching figure

Until now, we were using three EPS (created from SVG) that were downloaded
from https://www.flaticon.com. Therefore it was necessary to acknowledge
the creators and put a link to the webpage. This consumed space in the
caption and decreased the originality of the plot.

Another problem was that the "collaboration" icon (with three people in it)
had arrows, and some of those arrows pointed downwards, make ambiguity in
relation to the top-ward arrows under the commits.

With this commit, three alternative icons are added that I made from
scratch, using Inkscape. The collaboration icon now is two figures and two
speech-bubbles, without any arrows.

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