[luatex] lua transliterations on the fly

[Arthur Reutenauer]

>                The transliteration on the fly kinda works; but as
> warned by Philip, I've run into trouble because of one active char,
> namely, ~.

  Can't you just make tilde not active inside the \cbgreek macro?
Obviously it can't keep its original (non-breakable space) if you use it
for transliteration.

	Arthur