regent: Installation option to enable HDF support
regent: Installation option to enable HDF support

sdalton1/legion,chuckatkins/legion,StanfordLegion/legion,sdalton1/legion,sdalton1/legion,chuckatkins/legion,chuckatkins/legion,chuckatkins/legion,StanfordLegion/legion,sdalton1/legion,StanfordLegion/legion,StanfordLegion/legion,StanfordLegion/legion,chuckatkins/legion,StanfordLegion/legion,StanfordLegion/legion,sdalton1/legion,StanfordLegion/legion,chuckatkins/legion,sdalton1/legion,chuckatkins/legion