[lltx] luaotfload maintenance

[Patrick Gundlach]

> If more than one person or a small team should be involved in a
> project it is not enough to have powerful code you need also
> (publicitly available) code documentation, interfaces and layer
> definitions (as it is done in the latex3 project). 
> 

I can't agree enough. If not enough documentation /abstraction/interfaces are available then the whole project would be almost pointless.

Patrick