Letting Go of Type 1 Fonts

The 'dvir' package for R is limited in that it is only known to work on an (Ubuntu) Linux distribution with (at least) a full TeX installation. Unfortunately, not even that is true for recent stable Linux releases, like Ubuntu 20.04, because of a dependence on Type 1 fonts. This report describes an update to the 'dvir' package, plus some guidelines on avoiding Type 1 fonts, so that 'dvir' will work on recent stable Linux distributions (or at least Ubuntu 20.04).