Add protein features [neXtProt]

prot_features

Version	Tool Shed	Owner	Galaxy instances where the tool is available
2020.08.17	toolshed.g2.bx.psu.edu	proteore	usegalaxy.fr
2020.01.23	toolshed.g2.bx.psu.edu	proteore	usegalaxy.fr
2019.01.18	toolshed.g2.bx.psu.edu	proteore	usegalaxy.be