[Dev-luatex] Bad font scaling

[Barry Schwartz]

I do not know whether this is a luatex bug or a ConTeXt bug. Mark IV
seems to be incorrectly scaling and spacing PostScript fonts that have
unconventional em-unit-size settings, such as my Sorts Mill Goudy
fonts available here: http://www.theleagueofmoveabletype.com/

I presume that in one or more places the conventional value 1000 is
hard-coded in, where the setting specified in the font is what should
be used.