[XeTeX] ascii to unicode map for Hebrew

[Andy Lin]

> An easy way is to define a TECkit map. Such maps for Devanagari are
> available in xetex-devanagari package, very elaborate solution for
> Arabic scripts is in ArabXeTeX. It should be quite easy to prepare
> such a map for Hebrew.

Such a map might already exist in the TECkit package from SIL. IIRC,
they have mapping for all of their legacy (non-Unicode) fonts.

-Andy