More automation (generation of fontdata.js ; computation of tex_factor and adding variants) and configurability.
Fix issues about how the glyphs are copied to the math font ; now support all the legacy STIX font data.
Continue automatic generation of fontdata.js
follow-up
Fix some js errors in the generated fontdata.
take into account STIXMath
Use variable value in the FONTS structure.
Merge branch 'open-type-fonts' into stix-web-fonts
Use header from TeX's break-up-font