This was brought up during workshop: do we need two libraries for graphics D3 (phylo) and sigmajs (graph)?

I know sigmajs does have forceatlas which d3 probably doesn't have, but d3 has a bigger ecosystem and maybe we could rewrite force atlas to it. It seems also that D3 is more maintained, with sigmajs being at 3.0 beta since more than 1 year now: https://github.com/jacomyal/sigma.js/releases