ison­ums – Dis­play num­bers in maths mode ac­cord­ing to ISO 31-0

The pack­age makes a quick hack to zif­fer to dis­play num­bers in maths mode ac­cord­ing to ISO 31-0, re­gard­less of in­put for­mat (Euro­pean $1.235,7$ or An­glo-Amer­i­can $1,235.7$). The op­tions [euro, an­glo] con­trol the global in­put for­mat. De­fault in­put for­mat is an­glo. Doc­u­men­ta­tion is in­cluded as com­ments to the text source.