[tex-hyphen] zerohyph.tex and hyph-utf8

[Arthur Reutenauer]

> Given how flexible the lua language is, I would be surprised if you
> would *need* an empty file to solve whatever problem you are trying to
> solve. (I agree with Reinhard here.)
> 
> In my opinion the file zerohyph.tex was a dirty hack to prevent
> hyphenation for a particular language without having to modify the
> code. If the lua code for loading hyphenation patterns as shipped by
> hyph-utf8 (the part written by Manuel, Élie and Khaled) is not
> flexible enough, we should fix *that*.

  Agreed, and agreed.

	Arthur