general
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- change lua module names
- check for name conflicts ('module' used in mods)
- test
- reload check, declaration, luatex test
- import/update doc
- fix Makefile: test files are doc, not runfiles

regs
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- fix box & mark allocation (mathcherdef -> chardef)
- check why only 100 or so \inserts can be allocated
- make it work with Plain!