[XeTeX] Letterly fonts

[Arthur Reutenauer]

> For example the above links has Hangul in the body which surprisingly
> isn't rendered by DejaVu font which should have a very wide range of
> Unicode glyphs.

  The DejaVu fonts don't seem to cover Hangul, nor any other East Asian
script, for that matter.  See http://dejavu-fonts.org/ that mentions at
the bottom that the only scripts supported by all font styles are Latin,
Greek, Cyrillic, Armenian, and Georgian.  A half dozen other scripts is
supported by some families, but Hangul is not among them.

	Arthur