Add script to convert cell coordinates from plane to sphere#675

matthewhoffman wants to merge 2 commits intoMPAS-Dev:masterMPAS-Dev/MPAS-Tools:masterfrom

matthewhoffman:landice/convert-cellcoords-to-spherematthewhoffman/MPAS-Tools:landice/convert-cellcoords-to-sphereCopy head branch name to clipboard