[XeTeX] XeTex and Japanese kunten and warichū

[Michiel Kamermans]

Hi Jiang,

> CJKfntef works with XeCJK.

I was hoping to get underdotting to work without having to load xeCJK, 
in the same way that ruby works as its own package... xeCJK hijacks the 
to/from CJK interchar rules, so you can no longer issue normal fontspec 
instructions. When the parser goes from the closing } of the fontspec 
instruction to the following CJK character, xeCJK's interchar rules 
insert xeCJK's own fontspec command. While this is useful if you want to 
work exclusively with xeCJK for your CJK needs, it's maddeningly 
frustrating if you in fact don't, but are forced to rely on it in order 
to get some styling effect applied.

- Mike