[luatex] macros to invoke lua in LaTeX

[Hans Hagen]

Robin Fairbairns wrote:

> otherwise, the change over has been remarkably smooth.

btw, in the past my biggest 'waste-of-time' efforts were not a few 
primitives or differences between engines but

- uncommunicated changes in filenames (of for instance pattern files)
- changes in tds (that affect scripts and tex/mp lookups)
- changes in fonts (files, metrics, etc)
- command line switches

so, it could be worse -)

Hans

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