Issue #68: added separate pytest installation step to CI script for PyPI installations on Storz stack (due to issue of not recognising install options)
Issue #68: added separate pytest installation step to CI script for PyPI installations on Storz stack (due to issue of not recognising install options)

gift-surg/GIFT-Grab,gift-surg/GIFT-Grab,gift-surg/GIFT-Grab,gift-surg/GIFT-Grab