Display numbers in maths mode according to ISO 31-0
Description
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.
