[tex-hyphen] Add \{left,right}hyphenmin info to pattern files

[Mojca Miklavec]

Dear Werner,

On 4 March 2018 at 20:29, Werner LEMBERG wrote:
>
> right now a user has to know in advance what values for \lefthyphenmin
> and \righthyphenmin have been used to compute hyphenation patterns.
> This is problematic.  IMHO, it would be a much better solution if
> pattern files are self-contained.  I thus suggest to add to all
> hyphenation pattern files in the `tex-hyphen' repository two lines to
> the header comments:
>
>   % \lefthyphenmin=X
>   % \righthyphenmin=Y
>
> (with proper values for `X' and `Y').

This is in fact on immediate agenda, see
    https://github.com/hyphenation/tex-hyphen/pull/1/files

(wearing sackcloth and ashes for not finishing this and a couple more
trivial things earlier, but it should certainly be done before TL
2018)

Mojca