Consider adding tool: Newick display to support users running GTN 16S tutorial on main

[jennaj]

MTS: https://toolshed.g2.bx.psu.edu/view/dcorreia/newick_display/3200899efad9

Tool: Newick display - Display a phylogenetic tree as SVG v1.6

Tutorial: http://galaxyproject.github.io/training-material/topics/metagenomics/tutorials/mothur-miseq-sop/tutorial.html#otu-based-analysis

Section: "Tree", the tool Newick display is used after Mothur "Tree.shared Generate a newick tree for dissimilarity among groups (Galaxy Version 1.36.1.0)"

This tool missing from Main is one of the warnings given when the workflow for the tutorial is imported at Main. (source: https://github.com/galaxyproject/training-material/tree/master/topics/metagenomics/tutorials/mothur-miseq-sop/workflows/)

@bgruening Is there a reason why this tool is also not included at https://galaxy.uni-freiburg.de or why we should avoid using it at https://usegalaxy.org?

@nekrut @jxtx What do you think about adding this tool?