general
-------

- change lua module names
- change TeX macros prefixes
- check for lua name conflicts ('module' used in mods)
- check for macros starting with \luatex
- write test files
- reload check, declaration, luatex test
- import/update doc
- fix Makefile: test files are source, not runfiles
- make tests cleaner: \begingroup\expandafter\ETC.
- handle catcodes for Plain
- import/write doc

regs
----

- \mathchardef -> \chardef in \et@xgblk and \et@xlblk
- check more carefully before redfining a macro