Check for unrealistic OpenType font character widths
Check for unrealistic OpenType font character widths

Some characters in OpenType fonts have invalid widths (perhaps
as a result of numeric overflow?) that result in a "font contains
bad /Widths" warning in Acrobat Reader.

Limit OpenType font character widths to 5 * unit width to avoid
this warning.

simoc/mapyrus,simoc/mapyrus,simoc/mapyrus